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    13．--Mr. Zhang.this problem is too difficult． --Don't lose your heart．I believe ． A．you can work out it B．you can work it out C．you can't work it out 【查看更多】

     

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    --Mr. Zhang，this problem is too difficult．

    --Don't lose your heart．I believe ________．

    A．you can work out it                                    B．you can work it out

    C．you can't work it out

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