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--- 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 doB.must do
C.should have doneD.must have done

D

解析试题分析:考查情态动词。句意:——我本以为他在演讲比赛中会紧张,但结果他很平静。——他一定是准备得相当充分。must+ have done表示对过去的肯定的推测,意思是“肯定”,should have done 本应该做某事而实际没做。
考点:考查情态动词。

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