_____ we got to the station, the train had left already.

A. If
B. Unless
C. Since
D. When
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科目:初中英語(yǔ) 來(lái)源:同步題 題型:單選題

_____ we got to the station, the train had left already.
[     ]
A. If
B. Unless
C. Since
D. When

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