1.以下“if-elif-else”程序正确的是() A: if x>;yprint(x)elif y>;zprint(y)print(z) B: if x>;y:print(x)elif y>;z:print(y)else:print(z) C: if x>;y:print(x)elif x>;y:print(y)else:print(z) D: if x>;yprint(x)elif y>;zprint(y)elseprint(z)