The split between humans and living apes is thought by some scholars ____ 15 to
题型：不详难度：来源：
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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答案
| C |
解析
| 本题考查非谓语动词。 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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