Sally took a photo of her friends while they _________ computer games.
A．playB．a(chǎn)re playingC．have playedD．were playing
D
根據(jù)句意“塞麗為朋友照相”和下文句意“當他們玩電腦游戲時”可知，兩個動作同時發(fā)生，while后常接進行時。
【考點】動詞的時態(tài)。
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