2. 外语
  3. Paleontologists believe that fragments of primate jawbone unearthed in Burma and estimated at 40 to 44 million years old provide

Paleontologists believe that fragments of primate jawbone unearthed in Burma and estimated at 40 to 44 million years old provide

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问题 Paleontologists believe that fragments of 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 being.
选项 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
答案D
解析 根据estimate to do的用法，只能选D。或用主谓一致原则，排除B、C、E，再在A、D中选择。
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