（湖南省懷化市2014年高三第二次模擬考試）24. 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
句義：媽媽為家人做好清潔工作，但是最近她一直忙于教別人做清潔。本句的前面半句表示的媽媽經(jīng)常性習(xí)慣性的事情，故使用一般現(xiàn)在時表示經(jīng)常性的事情。故C正確。
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