John was cleaning the window and          Mary was watching TV.
A．a(chǎn)t the meantimeB．whenC．meanwhileD．while
C
詞義辨析。A.同時(shí)，一般謂語句尾  B.當(dāng)……時(shí)候   C. 副詞，同時(shí)  D.當(dāng)……時(shí)，強(qiáng)調(diào)兩個(gè)動(dòng)作同時(shí)進(jìn)行。句意：約翰正在擦窗戶，同時(shí)瑪麗正在看電視。While和and不能同時(shí)使用，故選C。
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