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_____ in the queue for half an hour, the old man suddenly realized be had left the cheque in the car.

A. Waiting
B. To wait
C. Having Waited
D. To have waited
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科目：高中英語 來源：山西省期末題 題型：單選題

_____ in the queue for half an hour, the old man suddenly realized be had left the cheque in the car.
[     ]
A. Waiting
B. To wait
C. Having Waited
D. To have waited

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