The split between humans and apes is believed by scientists______15 to 20 million years ago.

A. to be occurring     B. having occurred    C. to have occurred  D. to occur

 

【答案】

C

【解析】

試題分析：句意：科學(xué)家們認(rèn)為人類和猿類的分化發(fā)生在1500百萬到2000百萬年前。不定式的動(dòng)作的發(fā)生要早于謂語動(dòng)詞動(dòng)作的發(fā)生，因此用不定式的完成式，選C。

考點(diǎn)：考查非謂語動(dòng)詞

 

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