看看这一题。

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.

D. sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on

found in Puerto Rico in 1991-非限定修饰错；

have been dated at 34 million years old－这里表状态，时态错

on- 用of 表属性，on 错

T LESMM

可是C中的fossils.of (sloth that was)...was更错？？

谢谢weiyu 提醒，是错的，偶还发现C中一个致命的错误就是this单独使用－定错。

现在看，偶觉得应该选A, 其中and...做插入语修饰主语，此用法同OG 40

40.   In metalwork one advantage of adhesive-bonding over spot-welding is that the contact, and hence the bonding, is effected continuously over a broad surface instead of a series of regularly spaced points with no bonding in between.

(A) instead of
(B) as opposed to
(C) in contrast with
(D) rather than at（D）
(E) as against being at

静听大家的意见。

Fossils of the arm of a sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal ofthe Greater Antilles islands

LESMM:

第２个was和that was并列，句子没谓语，而且平行缺and

第２个was作谓语，主谓不一致: Fossils....was..

不好意思，又犹豫了一下，好像还是D对，原因如下：

到底是什么使sloth成为...最早知道的哺乳动物呢？是化石发现的时候还是其年代？显然是其年代。A与D的区别就是两个修饰成分的限定与否的互换。

A. sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it 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

   我选D，

   C选项错。我认为that修饰Fossils，后面用单数错，且making this 错

   A选项也错，如果按照LES说的插入语，那么A的意思就是：the sloth的手的化石（一串定语修饰）使得它成为最早的哺乳动物。。。

   意思错了

   应该是the sloth的手的化石被估计有34百万年老，（这个事实）使得the sloth成为最早的哺乳动物。

多谢各位NN！看来偶没选错。