问题

Where is my reference book? It was here a moment ago.—Someone ___ it by mistake.

A:could have taken
B:must take
C:might take
D:must have taken

正确答案是：

同类题型

This is the last chance to go abroad for further education ; don’t _____.

Mr. Smith won’t go to work if he this afternoon.

Could you tell me — Certainly. In half an hour.

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