问题
选择题
_______ we got to the station, the train had left already.
A．If
B．Unless
C．Since
D．When
答案
答案：D
题目分析：考查连词：A. If如果，B. Unless除非，C. Since自从，既然，D. When当…时候，句意：当我们到车站的时候，火车已经离开了。选D。
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_______ we got to the station, the train had left already.
A．If
B．Unless
C．Since
D．When
答案：D
题目分析：考查连词：A. If如果，B. Unless除非，C. Since自从，既然，D. When当…时候，句意：当我们到车站的时候，火车已经离开了。选D。