Question

5. ―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

Answer 1

5.    D考查情态动词及虚拟语气。句意："我本想他会在这次演讲比赛中紧张的，可是，他很平静。""他一定为之做了充分的准备。"此处must have done表示对过去事实有把握的推测， 意为"一定做了某事"。