_______ we got to the station, the train had left already.
A．IfB．UnlessC．SinceD．When
D

試題分析：考查連詞：A. If如果，B. Unless除非，C. Since自從，既然，D. When當(dāng)…時(shí)候，句意：當(dāng)我們到車站的時(shí)候，火車已經(jīng)離開(kāi)了。選D。
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