单项选择题
A.(!a==1)&&(!b==0) B.(a<B) &&!c||1 C.a&&b D.a||(b+b)&&(c-a)
A.enum a=one, two,three; B.enum aone=9,two=1,three; C.enum a="one","two","three"; D.enum a"one", "two","three";