题目内容

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

试题分析：句意：科学家们认为人类和猿类的分化发生在1500百万到2000百万年前。不定式的动作的发生要早于谓语动词动作的发生，因此用不定式的完成式，选C。
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