请教大全748、849题：不定式

gemj

以下是引用john1388在2003-11-8 9:54:00的发言：
Q: "to have tasted it for the first time without requesting more"

1. "for the first time" decides to ues "tast it" rather than " have tasted it"
2. " taste" does not mean a continuous act. " have tasted" is not accurate.

Pls read a similar sentence:
  "to taste it in 1880 without requesting more"

很有道理！

cxj

gemj,

Are you sure the key of 849 is correct? is it possible the key is A?
Thanks a lot for your response

gemj

以下是引用cxj在2003-11-8 12:33:00的发言：
gemj,

Are you sure the key of 849 is correct? is it possible the key is A?
Thanks a lot for your response

是的，我又查了原始答案。的确是。

solome

试着说一说我的理解，请指教。

748是强调动作的延续性，句意是从有很多的人出现症状或者说患了病以后到现在还没有
好，所以使用现在完成时，表示过去发生的动作一直持续到现在。

849的不定式的功能我觉得主要是陈述一个事实，因为taste和request 都是当时的动作，
没有延续性。另外have been known to have tasted it看起来好象很不爽的感觉：）

19的时态问题我觉得是那两个动作都是在found之前发生的，要不然found什么呢。

cxj

solome  MM 的见解有道理!

gemj

再来一例：
325.    Geologists believe that the Bering land bridge, over which human beings are thought to have first entered the Americans, disappeared about 14,000 years ago when massive glaciers melted and caused the sea level to rise several hundred feet worldwide.
(A) are thought to have first entered
(B) were thought first to enter
(C) were thought at first to enter
(D) are thought of as first entering
(E) were thought to first enter

amigo

补充一题：
Balzac drank more than fifty cups of coffee a day and died of caffeine poisoning; furthermore, caffeine did not seem to bother Samuel Johnson, the great writer and lexicographer, who was reported to have drunk twenty-five cups of tea at one sitting.
(A) furthermore, caffeine did not seem to bother
(B) however, caffeine did not seem to bother
(C) however, caffeine did not seem to have bothered
(D) furthermore, caffeine did not seem to have bothered
(E) in addition, caffeine did not seem to bother

remeo

以下是引用gemj在2003-11-9 16:39:00的发言：
再来一例：
325. Geologists believe that the Bering land bridge, over which human beings are thought to have first entered the Americans, disappeared about 14,000 years ago when massive glaciers melted and caused the sea level to rise several hundred feet worldwide.
(A) are thought to have first entered
(B) were thought first to enter
(C) were thought at first to enter
(D) are thought of as first entering
(E) were thought to first enter

补充一题：
Balzac drank more than fifty cups of coffee a day and died of caffeine poisoning; furthermore, caffeine did not seem to bother Samuel Johnson, the great writer and lexicographer, who was reported to have drunk twenty-five cups of tea at one sitting.
(A) furthermore, caffeine did not seem to bother
(B) however, caffeine did not seem to bother
(C) however, caffeine did not seem to have bothered
(D) furthermore, caffeine did not seem to have bothered
(E) in addition, caffeine did not seem to bother

请看这2个例子！
按照john1388的观点：
2. " taste" does not mean a continuous act. " have tasted" is not accurate.
同理，第一个例子中的enter显然也不是一个连续性动作，而第二个例子中的bother看起来更像一个持续性动作。
但是事实上第一题的答案是A，第二题是B，这就很让我confused了，似乎john的这个观点还不足以判断，请NN解释。

solome

很多东西深究下去好象很糊涂似的。中午和ggmsn上讨论了一中午这个不定式的问题，我
觉得好象明白但是仍然是似乎不能保证100%的正确率。

gemj说的325选A，因为首先are thought to是现在的人认为和前面的Geologists believe
相呼应，另外have entered表示一个已经完成的动作，并且强调结果所带来的后果。

amigo的那个是不是3啊，用完成体，因为那个句子是对比一种结果。

amigo

我这题答案说选B，真是搞不懂。