______ 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 |
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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 |
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