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【单选题】
关于函数的调用，下列哪项说法是正确的？
A.
函数的形参和实参是通过变量的名字结合的，所以顺序不要求一致，但个数必须一致。
B.
函数的实参可以是常量、变量或表达式。
C.
如果函数的实参是变量，前面也必须写出类型名。
D.
函数的调用只能出现在表达式中，不能单独加分号构成语句。
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