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You should tell the manufacture that the design of the furniture _____ meet the need of customers, or their products will not sell well.

  A. must                           B. shall                                 C. may                                  D. need

You should tell the manufacture that the design of the furniture _____ meet the need of customers, or their products will not sell well.

 A.must                B. shall                  C. may                  D. need