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Sally took a photo of her friends while they _________ computer games.

A. play                  B. are playing         C. have played              D. were playing


【答案】D

【解析】本题考查动词的时态。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。故选D。


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