问题
选择题
--- 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
答案
答案：D
题目分析：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。