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    I couldn't understand at the poor child. A. you to laugh B. you laugh C. why laugh D. you laughing 【查看更多】

     

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    I couldn't understand ______ at the poor child.

         A. you to laugh     B. you laugh         C. why laugh         D. you laughing

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    I couldn't understand ______ at the poor child.

    A．you to laugh

    B．you laugh

    C．why laugh

    D．you laughing

     

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