在一个FORTRAN程序中，作用域为整个程序的符号名是（）。

A.数组名

B.变量名

C.函数子程序名

D.语句函数名

--I didn't tell my parents that I would leave home.

--You ________ when you left home since you are living with them.

A．ought to have

B．might have

C．should

D．must