题目内容

Sally took a photo of her friends while they _________ computer games.
A．playB．are playingC．have playedD．were playing
D
根据句意“塞丽为朋友照相”和下文句意“当他们玩电脑游戏时”可知，两个动作同时发生，while后常接进行时。
【考点】动词的时态。
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