I just don't understand （） that prevents so many Americans from being as happy as one might expect. ( 章节：2 难度：1)
- A、why it does
- B、what it does
- C、what it is
- D、why it is
正确答案:C
答案解析:有
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I just don't understand （） that prevents so many Americans from being as happy as one might expect. ( 章节：2 难度：1)
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