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    ( )- Grandpa is getting old and he has trouble what others say to him. A. hear B. to hear C. hearing D. have heard 【查看更多】

     

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    Grandpa is getting old and he has trouble ________ what others say to him.
    [     ]
    A. hear        
    B. to hear        
    C. hearing    
    D. heard

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    Grandpa is getting old and he has trouble ________ what others say to him.

    A. hear        B. to hear        C. hearing    D. heard

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    Grandpa is getting old and he has trouble ______ what others say to him.

    A．hear

    B．to hear

    C．hearing

    D．heard

     

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    Grandpa is getting old and he has trouble ________ what others say to him．

    [　　]

    A．hear

    B．to hear

    C．hearing

    D．have heard

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