问题

I knocked but nobody answered the door. —-They _____asleep then and didn’t hear you.

A:must be
B:should be
C:must have been
D:should have been

正确答案是：

同类题型

I’m sorry that I shouted at you this morning.— ________， but please don’t get angry so often.

The new bridge ________ by the end of last month

Do they like pears No, _____

_______ some of my students don’t pass theexam, _______ I will continue encouraging them to make success next time.

ou finished all your exercises—Yes, ___ is left. As a matter of fact,they are as easy as ABC.