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以下选项中,不合法的Visual Basic的变量名是___( )___。 A. a5b B. _xyz C. a_b D. andif 执行以下 a$="Visual Basic Programming" b$="C++" c$=UCase(Left$(a$,7)) & b$ & Right$(a$,12) 后,变量c$的值为_____B___。 E. A.Visual BASIC Programming B.VISUAL C++Programming C.Visual C++Programming F. D.VISUAL BASIC Programming