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若a>2,则下列各式中一定正确的是………………………………………………( )
(A)a-5<-3 (B)ab2>2b2 (C)-10a<-20 (D)1-a>3
(A)a-5<-3 (B)ab2>2b2
(C)-10a<-20 (D)1-a>3