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    Both his parents look sad . Maybe they what's happened to him. A. knew B. have known C. must know D. will know 【查看更多】

     

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    Both  his  parents  look  sad . Maybe  they  _____ what's  happened  to  him.
    [     ]
    A.  knew    
    B.  have known    
    C.  must know    
    D. will know

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    Both his parents look sad.  Maybe they       _   what's happened to him.            
    [     ]
    A. knew          
    B. had known      
    C. have known  
    D. will know

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    Both his parents look sad. Maybe they           what's happened to him.?
    [      ]
    A. knew    
    B. have known    
    C. must know    
    D. will know

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    Both his parents look sad．Maybe they ________ what's happened to him．

    [　　]

    A．

    knew

    B．

    have known

    C．

    must know

    D．

    will know

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