题目内容
When I try to understand __________that prevents so many Americans from being as happy as one might expect, it seems that there are two causes.
A. why it does B. what it does C. what it is D. why it is
C
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题目内容
When I try to understand __________that prevents so many Americans from being as happy as one might expect, it seems that there are two causes.
A. why it does B. what it does C. what it is D. why it is
C