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    ----- How on earth did these problems ? ----- Because they ignored the advice of the expert. A. come across B. come down C. come on D. come about 【查看更多】

     

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     ----- How on earth did these problems _______?

       ----- Because they ignored the advice of the expert．

         A．come across                                    B．come down    

           C．come on                                        D．come about

     

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