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. hav-高中英语-n多题

◎ 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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