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    ( )Stamps are used for letters. A.send B.sent C.sending D.to send 【查看更多】

     

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    Stamps are used for ______ letters.  
    [     ]
    A. send    
    B. to send    
    C. sending    
    D. sent

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    Stamps are usually used _____letters.

    A．to sending

    B．to send

    C．for send

    D．for sent

     

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    Stamps are usually used ________ letters．

    [　　]

    A．to sending

    B．to send

    C．for send

    D．for sent

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