— Do you have to take care of your mother at home ?
— Yes , I ____ .
A．doB．have toC．haveD．shall
B。
回答情態(tài)動(dòng)詞 have to 的一般問(wèn)句時(shí)肯定用 have to 或 must , 否定用 don''t have to 或 needn''t。
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