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
题目分析：句意：当他们玩电脑游戏时，Sally给她的朋友拍了照。句中用过去进行时，表示过去的某个时间正在发生的动作；故选D。A 一般现在时；B 现在进行时；C 现在完成时。