.--The boy has to stay at home to look after his little sist

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.--The boy has to stay at home to look after his little sister,____?---Yes,beacause his mother has
A does he B is he C doesn't he D hasn't he

答案选C doesn't he
当have,has 不表示“拥有”的意思,或不是作助动词时,否定句或疑问句中要使用助动词do,does或did.题目中的has to 相当于情态动词,疑问或否定语气时应该使用助动词does,因此,不能选择B或D.根据前面的陈述部分是肯定语气,答案是C.

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