问题
选择题
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
答案：C
题目分析：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。