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    I try to understand that prevents so many people from being as happy as they expect. A. why it does B. what it does C. what it is D. why it is 【查看更多】

     

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    I try to understand _______ that prevents so many people from being as happy as they expect.

    　　 A. why it does　 B. what it does　　 C. what it is　　　　 D. why it is

     

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