问题

My bicycle is nowhere to be found. Who ___have been using it
A:Working as a waiter
B:must
C:could
D:might
B:must
C:could
D:might
正确答案是:
同类题型
Had it been possible I would have gone to the movies but I ________ too busy.[ ]
We were finally able to make the customers _______ of the quality of the refrigerator [ ]
______ a certain doubt among the people as to the practical value of the project
Mother’s Day is coming. I’m going back home to see my mother. — ______.