【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 |