___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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