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    __________ is still unknown __________ the man organized the construction of Stonehenge.

    A. It; that　　　　 　　　　　　　　 B. It; whether

    C. That; that　　　　 　　　　　　　　    D. That; whether

     

    答案：B
    解析：

    It 做形式主语,后面whether引导的句子才是真正的主语。

     


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