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    When I try to understand that prevent so many Americans from being as happy as one might expect, it seems to me that there are two causes. A. why it does B. what it does C. what it is D. why it is 【查看更多】

     

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    When I try to understand ________ that prevent so many Americans from being as happy as one might expect, it seems to me that there are two causes.

    [　　]

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

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