______ in the queue for half an hour, the old man suddenly realized he had left the check 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 check in the car.
| A．Waiting | B．To wait |
| C．Having waited | D．To have waited |
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