You should be careful of such a person _flatters you in your presence and speaks ill of you in
问题描述：
You should be careful of such a person _flatters you in your presence and speaks ill of you in
in behind.为什么填as,不填who?
答
such...as...为配套搭配用who 其实我觉得也读得通，为什么有such就必须有as?配套搭配牵强啊！算了，，高中英语从来就这么死。。还是谢谢了！