In spite of allhas been said，quite a lot of people are still uncertain about the prices of

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(答案→)A. that
B. what
C. which
D. as
解析：考查定语从句。定语从句That has been said修饰先行词all. All是一个表示事物的不定代词，在定语从句里做先行词要使用that指代它。本句中that指代all,在句中做主语。句意：尽管已经说了很多。有很多人对于中国的房价仍然不敢确定。