Joan has already bought some potoes,so you ______ to buy them.A.needn't B.needn't to C.doesn't need D.don't need该选什么?还要有原因,就是为什么选这个

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Joan has already bought some potoes,so you ______ to buy them.A.needn't B.needn't to C.doesn't need D.don't need该选什么?还要有原因,就是为什么选这个

Joan has already bought some potoes,so you ______ to buy them.A.needn't B.needn't to C.doesn't need D.don't need该选什么?还要有原因,就是为什么选这个
Joan has already bought some potoes,so you ______ to buy them.
A.needn't B.needn't to C.doesn't need D.don't need
该选什么?还要有原因,就是为什么选这个

Joan has already bought some potoes,so you ______ to buy them.A.needn't B.needn't to C.doesn't need D.don't need该选什么?还要有原因,就是为什么选这个
选D.
need有做行为动词,以及情态动词.
在这里做行为动词,前面需要助动词do,所以A,B都排除.
而空格前面的主语是You,所以对应的是don't.而doesn't是第三人称单数的,C也排除

A, 考察need的用法,此处理解为你不需要买,用need to do sth 这个结构

D,因为need当情态动词用否定形式是needn't,后不加to,当实义动词时否定是don't need,后加不定式