试题详情
- 单项选择题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
- C
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A、why it does
B、what it does
C、what it is
D、why it is
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