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问题

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
正确答案是:
同类题型

The tomato juice left brown ____ on thefront f my jacket

I can’t believe that anyone else in the school can swim as fast as you,     ?

We must read between the lines, and sometimes _____ the lines, to fully understand the writer.[ ]

How I wish I _____ have a long holiday, doing things that I like. [ ]

My son is _____ to be seen Where has he gone — I think he _____ in the building

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