________in the queue for an hour，he suddenly realized he had left the cheque at home.
| A．Waiting |
| B．To wait |
| C．Having Waited |
| D．To have waited |
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________in the queue for an hour，he suddenly realized he had left the cheque at home.
| A．Waiting |
| B．To wait |
| C．Having Waited |
| D．To have waited |
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