________ is expected, according to the online survey, is that prices of houses will not go up any more．
A.As
B.It
C.What
D.Which
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C解析考查主语从句。题干中according to the online survey是插入语，去掉后很明显可知________ is expected是主语从句，因此选C。本句话还可以转换为as引导的非限制性定语从句：As is expected，according to the online survey, prices of houses will not go up anymore．同时也可以转化为it作形式主语的形式：It was expected, according to the online survey, that prices of houses will not go up any more．