The split between humans and living apes is thought by some scholars ____ 15 to 20 million years ago.[ ]A. to occurB. occurringC. to have occurredD. having -高中英语-魔方格

◎ 题干

The split between humans and living apes is thought by some scholars ____ 15 to 20 million years ago.

[ ]

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

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◎ 解析

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◎ 知识点

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