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________ is often the case, we have worked out the production plan.

     A. Which               B. When                C. What               D. As

34.  ________ is often the case, we have worked out the production plan.

     A. Which           B. When           C. What          D. As

10.       is often the case, we have worked out the production plan.

A. Which      B. When      C. What       D. As

_____ is often the case, we have worked out the production plan.

       A. Which              B. When                   C. What            D. As