In C language,(70)variables have to be defined outside of any function, this(71)actual storage for it.
A.internal
B.export
C.output
D.external

A.A.internal
B.export
C.output
D.external

【参考答案】

D
解析：译文：C语言中，外部变量必须在所有函数体之外定义，并为之分配实际内存空间。