3. Rock samples taken from the remains of an asteroid about twice the size of the 6-nuke-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.
B. has been dated at 3.47 billion years old and thus
C. have been dated to be 3.47billion years old and thus are
D. have been dated as being 3.47 billion years old and thus
E. have been dated at 3.47billion years old and thus are
C和E哪个对？
Given an infinite amount of time, even a probability of ten to the forty thousandth would be possible. We do not, however, have an infinite amount of time. The earth has been dated to be 4.6 billion years old. But until 3.98 billion years ago, the earth was too hot to produce life. The oldest fossils on record date back 3.85 billion years ago. Understanding that there could be older fossils that have not yet been found, but not calculating that possibility into this equation, we are left with a 130 million year time frame for an "accident" to occur. This indeed is impossible. Therefore since life could not have, mathematically, been accidentally formed, there must have been a creator. This creator is God.
Living snails were C14 dated at 2,300 and 27,000 years old
above are from google......no answer...
3. Rock samples taken from the remains of an asteroid about twice the size of the 6-nuke-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old an dthus is evidence of the earliest known asteroid impact on Earth.
C. have been dated to be 3.47billion years old and thus are
晕了，居然想到 Rock samples are evidence ---，可能不行？
OG中常出现考点，“主语＋be＋宾语（名词）”其中主语、宾语应单复数对应？
想起了OG14:
Paleontologists believe that fragments of a primate jawbone unearthed in
(A) at 40 to 44 million years old provide evidence of
(B) as being 40 to 44 million years old provides evidence of
(C) that it is 40 to 44 million years old provides evidence of what was
(D) to be 40 to 44 million years old provide evidence of（D）
(E) as 40 to 44 million years old provides evidence of what was
想起了OG14:
Paleontologists believe that fragments of a primate jawbone unearthed in
(A) at 40 to 44 million years old provide evidence of
(B) as being 40 to 44 million years old provides evidence of
(C) that it is 40 to 44 million years old provides evidence of what was
(D) to be 40 to 44 million years old provide evidence of（D）
(E) as 40 to 44 million years old provides evidence of what was
版主这个例子好啊，确实可以解决真题3中C选项的前半部分，但上例谓语动词 为provide，与evidence搭配没问题
真题3中C选项 后半部分用 are 作谓语，能接不可数名词evidence（意为"证据”）么？
gemj后来告诉我，没有这样的对应，只能先记住了
嘿, 我查了一个非常老版的字典--朗文词典的第一版. 里面有:
The unusual shape of this pot dates it at about AD 400.
我觉得这应该是正确的例句,所以E应该是争取答案.
再加上我们的heartstring,以及现代的简单语法,可能大家都会觉得date..to be顺口, 更有肯能那是ETS设下的陷阱了.
希望还有人翻查字典提供权威依据.
补充250 有一题涉及date 用法
218. The domesticated camel, which some scholars date around the twelfth century B.C., was the key to the development of the spice trade in the ancient world.
(A) The domesticated camel, which some scholars date
(B) The domesticated camel, which some scholars having thought to occur
(C) Domesticating the camel, dated by some scholars at
(D) The domestication of the camel, thought by some scholars to have occurred（D）
(E) The camel’s domestication, dated by some scholars to have been
jnlvo 的语法大全简注里对date 地解释：
E) sb. date sth. to be，错, 正确sb. date sth.。
date from something phrasal verb：to have existed since a particular time in the past
The church dates from the 13th century.
date: tr.
To mark or supply with a date: date a letter.
To determine the date of: date a fossil.
To betray the age of: Pictures of old cars date the book.
e
dated at
date
verb [T]
1. to say how long something has existed or when it was made:
Archaeologists have been unable to date these fossils.
An antique dealer had dated the vase at (= said that it was made in) 1734.
2. to write the day's date on something you have written or made:
[+ object + noun] Thank you for your letter dated August 30th.
PS: the source above is from Cambridge Dictionaries Online
引自CBS文章：The rock samples have been age-dated at 3.47 billion years old and are the oldest known evidence of an asteroid impact on the Earth。
不过这里有点不同，是age-dated。
跟前面的vaporization2003一样，也搜到些矛盾的例句，如：
two lava flows have been dated precisely at 3.46 billion and 3.47 billion years old.
These things have been dated to be between 3.46 and 3.47 billion years old.
综合起来：可能ETS认为be是多余的，因为字典里可见：
We can date the skeleton to approximately 2500 BC.
且搜到较多的例子是省的，如The uranium was found in zircons at both the Australian and South African sites and was dated to within 2 million years of 3.47 billion years ago.
待验证。
jnlvo,你给的例句是不一样的，dated to be between 3.46 and 3.47 billion years old，
date the skeleton to approximately 2500 BC
dated to within 2 million years of 3.47 billion years ago.
意思可不一样。
狗狗的词典引用并不能说明这道问题。
关键是你给出的这个例句太让人费解了! 我们一般说多大年龄都说：I'm xx years old.所以这里我一直觉得用be更加合适。at只能说在哪个时间点。
I think E is right. Using google，I got the same result as "狗狗"。But I dont know why.
I vote for C.
date to be 表示动作， date at 表示结果
我选C
OG上的例子, 看看这回可以解释吗?
9. Astronomers at the Palomar Observatory have discovered a distant supernova explosion, one that they believe is a type previously unknown to science.
(A) that they believe is
(B) that they believe it to be
(C) they believe that it is of
(D) they believe that is
(E) they believe to be of
Choice E is best. The pronoun that in A and B should be deleted, since the pronoun one is sufficient to introduce the modifier and the sentence is more fluid without that. In B and C, it and that it are intrusive and ungrammatical: the idiom is "believe x to be y." In the context of this sentence, the infinitive to be is more appropriate than the limited present-tense is in referring to an event that occurred long ago but has been discovered only recently. Finally, A, B, and D lack o/and so illogically equate this particular explosion with the whole class of explosions to which it belongs: it is not a type but possibly one of a type
这个，I am 99 years old 与本题毫无关系。
这个同位素检测法，检测出来是多少年前，这个是一个确定的时间点，这个点可以无穷小。
所以必须用at。 并不是date at是个固定用法。
I picked C at first thought, but please see below fyi:
The oldest moon rock found thus far was dated at 4.6 billion years old.
I guess E is correct.
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