29、_____ in the line 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
科目：高中英語 來源： 題型：
_____ in the line 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
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