问题补充:
— Do you have to take care of your mother at home ?
— Yes , I .
A. do
B. have to
C. have
D. shall
答案:
A. do
(答案→)B. have to
C. have
D. shall
解析:回答情态动词 have to 的一般问句时肯定用 have to 或 must , 否定用 don\t have to 或 needn\t。
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