Sally took a photo of her friends while they_____computer games.
A．playB．a(chǎn)re playingC．have playedD．were playing
D

試題分析：句意：Sally照了一張她朋友們玩電腦游戲的照片。while“當...時候”，后面跟進行時或延續(xù)性動詞。本題主句一搬過去時，從句發(fā)生在過去正在進行的動作，因此要用過去進行時。故選D。
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