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题目
I try to understand ------that prevents so many people from being as happy as they except
A.why it does
B.what it does
C.what it is
D.why it is
能不能说一下为什么呢?

提问时间:2020-09-27

答案
答案为C,what引导的为宾语从句,后面的that又为what的定语从句.
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