21. Paleontologists believe that fragments of a primate jawbone unearthed in
and estimated at 40 to 44 million years old provide evidence of a crucial step along the evolutionary path that led to human beings.
(A) at 40 to 44 million years old provide evidence of
(B) as being 40 to 44 million years old provides evidence of
(C) that it is 40 to 44 million years old provides evidence of what was
(D) to be 40 to 44 million years old provide evidence of
(E) as 40 to 44 million years old provides evidence of what was
本题答案D不难，由主谓一致排除B.C.E,estimated 被动接续排掉A，可是我看不懂这个and 前后的并列成分是什么。我觉得Paleontologists believe that fragments（of a primate jawbone unearthed in
哦，懂了谢谢。
| 欢迎光临 ChaseDream (https://forum.chasedream.com/) | Powered by Discuz! X3.3 |