问题
选择题
____ 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
答案
答案：C
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____ 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
答案：C