—Whendidtheclassroomhaveapowercut?—Thismorning,whilewe
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问题详情:
—When did the classroom have a power cut?
—This morning, while we ________ a physics lesson.
A. have had B. were having C. are having D. will have
【回答】
B
知识点:动词时态
题型:选择题
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