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    17、Venus has a dense atmosphere, _____ we know very little.                  

    A. its composition                              B. whose composition

    C. about which composition                D. about whose composition

     

    17、D

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    Venus has a dense atmosphere, _____ we know very little.                  

    A. its composition                              B. whose composition

    C. about which composition                D. about whose composition

     

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    科目：高中英语 来源： 题型：

    Venus(金星) has a dense atmosphere, ______ we know very little.

        A. its composition                             B. about whose composition

     C. about which composition                          D. whose composition

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