The split between humans and apes is believed by scientists______15 to 20 million years ago.
A．to be occurringB．having occurredC．to have occurredD．to occur
C

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。不定式的動作的發(fā)生要早于謂語動詞動作的發(fā)生，因此用不定式的完成式，選C。
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