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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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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