Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years
old, made it the earliest known mammal of the Greater Antilles islands.
A. sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the
earliest known mammal of
B. sloth, that they found in Puerto Rico in 1991, has been dated at 34 million years
old, thus making it the earliest mammal known on
C. sloth that was found in Puerto Rico in 1991, was dated at 34 million years old,
making this the earliest known mammal of
D. sloth, found in Puerto Rico in 1991, have been dated at 34 million years old,
making the sloth the earliest known mammal on
E. sloth which, found in Puerto Rico in 1991, was dated at 34 million years old,
made the sloth the earliest known mammal of
已经是在复以前做过的了，可是这次还是选错了！偶选了E，答案是D。去语法总链接里找了，没看到有着道题的，所以就只好自己发个帖子~~嗨，快考了，可语法每次还是错很多，感觉还没有入门呢~~~250刀啊，真是不甘心把钱白白得让ETS 赚去！哪个牛牛帮我解释一下~
偶也觉得E这个样子which的位子有点怪，当时选的时候觉得D的句子重心好像变了，但是可能关键不是在这里吧，偶很菜鸟地说…… 谢谢！
Can anybody please explain why, in D, "Have" can be used instead of were.
THanks.
have强调对现在的影响！
现在完成时对于不可延续的动作，表示过去的动作一直影响至今，而一般现在时对于不可延续的动作，表示动作发生在过去，和现在没有任何关系。
BCE错误是否主要在于谓语动词都为单三形式？而原句中的主语中心词为Fossils，所以错误。而A选项中的IT是否指代错误，一点拙见！
这题只要抓住中心词是fossils，则A,B中it指代错，C，E中was错
D;
A-incorrect use of past tense "made" when, apparently, the sloth continues to be the earliest known mammal of the Greater Antilles; a condition which requires the progressive tense "making" to accurately relate the ongoing nature of the condition;
B-"they" has no clear referent, plus, the construction is awkward in the terminal clause;
C-subject-verb agreement error--"Fossils" is plural, "was" is singular;
E-combines the problems of A and C.
Before reading the 5 options, notice the errors are:
Now start with B: “has” is wrong, same logic error.
C: “was” should be “were”
D: correct
E: same logic error.
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