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This is a ____ book that you may _____ in daily English study.

A. referring; refer to　　　 　　　　 　　　 　　B. referring; refer

C. reference; refer to 　　　　 　　　　　 　　D. referred; refer to

       This is a ________ book that you may ________ in daily English study.

       A. referring; refer to                              B. referring; refer

       C. refrence; refer to                               D. referred;refer to