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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 答案:1.B 现在完成时主要强调过去发生的动作对现在造成的影响.或过去发生的动作还未结束.一直持续到现在或将来.重点在于对现在的?影响?. 【查看更多】

     

    题目列表(包括答案和解析)

    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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