It's unfair of him to pay for everything,______?A.isn't it B.is it C.isn't he D.is he

问题描述:

It's unfair of him to pay for everything,______?A.isn't it B.is it C.isn't he D.is he

我觉得答案是C.
反义疑问句前半部分肯定,后半部分否定或前否后肯,unfair虽然是UN开头,但是仍然看作肯定形式,所以后半部分用否定.