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    Scientists are now working humanoids. Because they can help people a lot. A. on B. against C. into D. to 【查看更多】

     

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    Scientists are now working ________ humanoids. Because they can help people a lot.

    A. on

    B. against

    C. into

    D. to

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    Scientists are now working _        humanoids(类人生物) because they can help people a    lot.        
    [     ]
    A. on                
    B. against        
    C. into          
    D. to

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