David is such a good boy _________ all the teachers like.　　A.that B.who C.as D.whom

题目

David is such a good boy _________ all the teachers like.　　A.that B.who C.as D.whom
但是为什么不选B和D who和whom也可以做宾语的啊?

答案

刚才答错了,选C
就记住吧：定语从句中,当先行词前有such,so,as时,关系词应当用as