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    Try at the back door if nobody hears you at the front door. A. to knock B. and knock C. knocking D. and to knock 【查看更多】

     

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    Try ________ at the back door if nobody hears you at the front door.


    1. A.
      to knock
    2. B.
      to be knocking
    3. C.
      knocking
    4. D.
      your best to knock

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    Try ________ at the back door if nobody hears you at the front door.

    [　　]

    A．to knock
    B．to be knocking
    C．knocking
    D．your best to knock

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    ______ at the back door if nobody hears you at the front door.

    [　　]

    A．Trying to knock　　B．Try to knock

    C．Trying knocking　　D．Try knocking

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