单项选择题

计算z的值,当x大于y时,z=x;否则z=y。下列语句错误的是

A.If x>=y Then z=x:z=y
B.If x>=y Then z=x Else z=y
C.z=y:If x>=y Then z=x
D.If x<=y Then z=y Else z=x