________ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.
| A．To wait |
| B．Have waited |
| C．Having waited |
| D．To have waited |
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________ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.
| A．To wait |
| B．Have waited |
| C．Having waited |
| D．To have waited |
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