天山 5-28

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

MINE A

ANS C

this these不是不能指代么?

C. was 错， 主语是 fossiles

i think the key should be D

可是D中的the earliest known mammal on..這個on有問題吧..

應該是the mammal of the Greater ....earliest known是加入修飾的..

但是C中,,was也有問題..照理說,,fossils為主語,,謂語應該為複數才對..

D中的have been似乎改正了這點..

總的來說,,C與D都有點不足之處,,不曉得這樣的理解對不對??

請NN賜教

Agree with Choice: D

A中and dated错, make "it" 指代不清，B “,that they found”严重错，"has been" 主谓不一致，C "this"指代不清，E 是run on 句型，只有D没有明显错误。

agree with D