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C语言程序设计单选题中等

下面哪一个函数调用可以检测文件是否成功打开？

Afopen("test.txt", "r")
Bif (fopen("test.txt", "r") == NULL)
Cif (fopen("test.txt", "r") == 0)
Dif (fopen("test.txt", "r") == 1)
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