Question

【题目】___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

【答案】C

【解析】句意：排队等了半个小时之后，那个老人忽然意识到他把支票忘在车上了。不定式表示目的，与题意不符，故可排除B和D；A项表示动作和句子谓语动词动作同时发生；C项表示动作已经发生或先于句子谓语动词发生，根据句意可知答案。