【題目】Before we arrived, the train___ already.

A. did; leave B. have; left

C. was; leaving D. had; left

【答案】D

【解析】

試題分析：句意：在我們到達之前，火車已經(jīng)離開了，根據(jù)before引導的時間狀語從句，可知，主句用過去完成時，從句用一般過去時態(tài)。結(jié)合語境，故選D。

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