【题目】Paul did a great job in the speech contest. He many times last week.
A. need have practisedB. might practise
C. must have practisedD. could practise
在线课程【答案】C
【解析】
考查情态动词。句意：保罗在演讲比赛中表现得很好。他上星期一定练习了很多次。must have done是对过去发生的动作最有把握的猜测，意思是“一定”。故C选项正确。