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John was cleaning the window and          Mary was watching TV.
A.at the meantimeB.whenC.meanwhileD.while
C
词义辨析。A.同时,一般谓语句尾  B.当……时候   C. 副词,同时  D.当……时,强调两个动作同时进行。句意:约翰正在擦窗户,同时玛丽正在看电视。While和and不能同时使用,故选C。
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