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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(dāng)他們玩電腦游戲時(shí)”可知，兩個(gè)動(dòng)作同時(shí)發(fā)生，while后常接進(jìn)行時(shí)。
【考點(diǎn)】動(dòng)詞的時(shí)態(tài)。
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