My mother _____ all the cleaning for my family, but recently she has been too busy teaching to do it.
A．will doB．is doingC．doesD．had done
C

試題分析：句意：我的母親包攬家里的清潔工作，但是最近她忙于教學(xué)而無(wú)法做清潔工作。根據(jù)句意可知母親做清潔工作是經(jīng)常性的動(dòng)作，所以用一般現(xiàn)在時(shí)。故選C。
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