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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:高中英语 来源:山西省期末题 题型:单选题

_____ 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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