Question

______ in the queue for half an hour, the old man suddenly realized he had left the cheque in

the car.

A. Waiting         B. To wait        C. Having waited        D. To have waited

Answer 1

C

解析:

考查非谓语动词的用法。根据the old man与wait之间的关系，应该选择-ing形式，再根据句意得知他是先"wait " 后才"realize"。所以先发生的动作应该选完成式的Having waited。