高三英语的.（）is expected,according to the online survey,is that h

高三英语的.（）is expected,according to the online survey,is that housing price can't go up any more.A.WhichB.WhatC.itD.as答案是选B,为什么不选as,

B.What
what引导主语从句.
如果用as,后面就不能要is that.即:
As is expected,according to the online survey,housing price can't go up any more.
所以不能选as
再问： 可以分析一下句子结构吗
再答： 1.What is expected,according to the online survey,is that housing price can't go up any more
What is expected是主语从句作主语; is是连系动词; that housing price can't go up any more是表语从句. according to the online survey作状语;

2.As is expected,according to the online survey, housing price can't go up any more.
As is expected是as引导的定语从句,as指代后面的句子housing price can't go up any more.
according to the online survey作状语
housing price can't go up any more是主句, housing price 是主语; can't go up 是谓动; any more是状语.