These chairs need mending,___ they?A.needn't B.mustn't C.don't D.need

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These chairs need mending,___ they?
A.needn't B.mustn't C.don't D.need

C.don't
这句话的结构是反问句
need在这里是动词,不是情态动词
所以不能用A.needn't
而B.mustn't 是干扰选项
也不选