Sallytookaphotoofherfriendswhilethey computergame...

来源：语文精选馆 3.25W

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

A. play B. are playing

C. have played D. were playing

D 句意：当他们在玩电脑游戏时, 萨莉给她的朋友们拍了一张照片。这是含有while引导的时间状语从句的主从复合句, 主句用了一般过去时, 时间状语从句也应该用相应的过去时态。由句意可知“拍照”这个动作发生时, 另一个动作“玩电脑游戏”正在进行, 故用过去进行时。