Youwillneverpasstheexamination_______you_______harderA.unless,don’tstudyB.unless,studyC.if,studyD.if,notstudy

　　Youwillneverpasstheexamination_______you_______harder

　　A.unless,don’tstudy

　　B.unless,study

　　C.if,study

　　D.if,notstudy