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        1. 1.I think it's useful advice.so I will always remember it.A.a B.an C.the D.不填 查看更多

           

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          I think it’s_________ useful advice,so I will always remember it.  

          A.aB.anC.theD./

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          I think it’s_________ useful advice,so I will always remember it.  

          A.a                B.an               C.the              D./

           

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          I think it’s_________ useful advice,so I will always remember it.  
          A.aB.anC.theD./

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          I think it's          useful advice,so I will always remember it.

          A.a                         B.an                       C.the                        D.不填

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