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    we humans are alone in the universe,scientists have scanned the sky for outer space signals and sent messages out into space. A.We wonder if B.Having known that C.To find out whether D.Not knowing why 【查看更多】

     

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    　　 we humans are alone in the universe,scientists have scanned the sky for outer space signals and sent messages out into space.

    A、We wonder if　 B、Having known that　　

    C、To find out whether　 D、Not knowing why

     

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