The girls______a game called Bomb happily when the teacher suddenly entered the classroom.
A．playedB．were playingC．are playingD．had played
B
考查時間狀語從句。根據(jù)entered可知，主句應該用過去時，排除C、D。句意“那些女孩正在玩一種叫‘Bomb’的游戲，當老師突然走進教室的時候�！备鶕�(jù)句意可知，主句應該用進行時。故選B。
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