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

29、C

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_____ 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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