—When did you come back?
—An hour ago. You     the computer games.        
A．have playedB．were playingC．playedD．had played
B
考察時態(tài)。句意：你什么時候回來的？——一小時前。你正在玩電腦游戲的時候�？芍挛拿枋龅氖窃谶^去某個時間正在進行的動作，故用過去進行時態(tài)，選B.
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