[求助]GWD13

chenxu

Q28:

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.

sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of

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

sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of   sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on

sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of

   my Answer: D

C correct

In choice C, the subject is fossils, the verb was can not agree with its subject

Q29:

For protection from the summer sun, the Mojave lived in open-sided, flat-topped dwellings known as shades, each a roof of poles and arrowweed supported by posts set in a rectangle.

each a roof of poles and arrowweed

each a roof of poles and arrowweed that are being

with each being a roof of poles and arrowweed

with roofs of poles and arrowweed to be

with roofs of poles and arrowweed that are

  my  Answer: E

A correct

rhod

28. D is the correct choice. 不过你的D选项好像错了，应该是

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

29. A是一个独立主格结构，相对于E简洁一些。

PS. GWD的题目可以参考一下LES置顶的讨论连接贴: http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=56794&page=1