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(题文)(2017江苏南京)—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
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(题文)(2017江苏南京)—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