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题库 / OG2015-SC-30
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.
at 40 to 44 million years old provide evidence of
as being 40 to 44 million years old provides evidence of
that it is 40 to 44 million years old provides evidence of what was
to be 40 to 44 million years old provide evidence of
as 40 to 44 million years old provides evidence of what was
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本体作主语，estimate to be；属性作主语，estimate at
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