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英语
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the split between humans and living ages is thought by some scholars ____15 to 20 million years ago
为什么填 to have occurred
人气：344 ℃ 时间：2020-01-29 03:36:32
解答
be thought to do 被认为做某事
因为后边是 15 to 20 million years ago 已经发生了!
因此用 不定式的完成式
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