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    ( ) ---- I’m not sure there are living things on the planets or not. ---- Even scientists aren’t sure about it. A. whether B. where C. why 【查看更多】

     

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    —I'm not sure _________there are living things on the planets or not.
    —Even scientists aren't sure about it.
    [     ]
    A. whether      
    B. where      
    C. why      
    D. what

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