问题
选择题
Sally took a photo of her friends while they _________ computer games.
A．play
B．are playing
C．have played
D．were playing
答案
答案：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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