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Paleontologists believe that fragments of a primate jawbone unearthed in Burma 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
【申友解析】
正确答案：D
动词estimated用在不定式to do的后面，主语是the fragments,复数，那么谓语动词应该用复数
A estimated用在at之后，错误
B estimated应该用在to be之后，谓语动词用单数，题目中是复数，错误
C 从句由that it is引导，逻辑错误
D 正确
E 主谓语的单复数不一致
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