is expected, according to the online survey, is that house prices will not go up any more.

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A. As
B. It
C. Which
(答案→)D. What
解析：考查名词性从句。本题的what is expected是一个主语从句，在句中做主语。It是形式主语；as引导非限制性定语从句。句意：根据一项网络调查，人们希望的事情是房价不要再上涨了。