【原创】Mr Smith was _____ flight to New York _____ he remembered he had taken all the family's keys to the doors with him.
| A．at; while |
| B．on; when |
| C．at a; while |
| D．on a; when |
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【原创】Mr Smith was _____ flight to New York _____ he remembered he had taken all the family's keys to the doors with him.
| A．at; while |
| B．on; when |
| C．at a; while |
| D．on a; when |
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