一、单项选择。 Unit 6 Topic2 Section A-B练习题( ) 1) Yesterday morning I was playing the piano _the door bell rang. A. when B. while C. after D. before( ) 2) Li Lei was running_ Michael was swimming. A. when B. while C. after D. before( ) 3) I wont leave here until my father _ back tomorrow. A. come B. came C. comes D. coming ( ) 4) Its about _ from my home to school. A. twenty minutes walk
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