问题

. —I’ve heard they went skiing in the mountainslastwinter.—It______ true because there was so little snow there then.

A:spots
B:points
C:tracks
D:mustn’t be

正确答案是：

同类题型

It was so quiet in the classroom that a needle _________ to drop onto the floor.[ ]

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How dangerous! I just avoided the cat.

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