My sister is so tired,she can hardly walk,__she?a.does b.can c.does't d.can't 为什么?

B.hardly在这里表否定，所以反义疑问句的语气要肯定。而且动词是“can”所以选B

does
因为hardly是个否定词
当陈述部分有never，seldom, hardly，few，little，barely, scarcely, nothing 等否定意义的词时，后面的反意疑问句则为肯定形式：
There are few apples in the basket, are there?
He can hardly swim, can he?
They seldom come late, do they?

b 因为hardly是含有否定意义的词,

B
反意疑问句,前肯后否,前否后肯,hardly表几乎不,是否定,所以后面肯定