问题补充：
is widely known that you value more what you haven’t rather than what you have .
A. As
B. What
C. It
D. Which
答案：
A. As
B. What
(答案→)C. It
D. Which
解析：考查it用法。本题中it指代从句that you value more what you haven’t rather than what you have .做形式主语，其它选项无此用法。故选C。
