Question

【题目】Sally took a photo of her friends while they ____ computer games.
A.play
B.are playing
C.have played
D.were playing

Answer 1

【答案】D
【解析】本题考查动词的时态。根据“萨莉为朋友照相”和下文“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。