问题补充:
My mother all the cleaning for my family, but recently she has been too busy teaching to do it.
A. will do
B. is doing
C. does
D. had done
答案:
A. will do
B. is doing
(答案→)C. does
D. had done
解析:句意:我的母亲包揽家里的清洁工作,但是最近她忙于教学而无法做清洁工作。根据句意可知母亲做清洁工作是经常性的动作,所以用一般现在时。故选C。