题目内容
I don't understand ________ that prevents so many Americans from being as happy as one might expect.
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
I don't understand ________ that prevents so many Americans from being as happy as one might expect.
A.why it does B.what it does C.what it is D.why it is
C