题目：
Black-box and white-box testing method ale often used in software testing phase, in which, the white-box is mainly used to test software's (73) .
A．external function of a program
B．reasonableness of structure
C．internal logic of a program
D．correctness of a program
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
