问题

I had thought he would be nervous in this speech competition, but he turned out to be calm. — He________quite enough preparation for it.

A:should do
B:must do
C:should have done
D:must have done

正确答案是：

同类题型

rd of $1,000 will be given to canprovide any clues to the case which has been investigated by the police fornearly half a year

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