you look .what is wrong with you?i failed in the English exam

问题描述:

you look .what is wrong with you?i failed in the English exam
A.sad B.sadly C.sadder D.more sadly
选哪个?为什么?

A.sad
这里没有比较的意味,排除C、D; look在此是系动词,所以要用形容词作表语,排除B.