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    The Shenzhou wouldn’t have been sent up successfully _________ for the great efforts of many scientists．

    [　　]
    A．

    if it were not

    B．

    were it not

    C．

    had it not been

    D．

    it had not been

    答案：C
    解析：

    这是一个与过去事实相反的假设，在非真实的条件句中，可把if去掉，把had提到句首。


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