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    It is necessary, of course, that the prices of the books are written for children by 50%. A. which ; are lowered B. that ; is lowered C. what ; should lower D. that ; be lowered 【查看更多】

     

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    It is necessary, of course, that the prices of the books _____ are written for children ______by 50%.
      A. which ; are lowered         B. that ; is lowered
      C. what ; should lower         D. that ; be lowered

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