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要打开一个已存在的用于修改的非空二进制文件“hello.txt”，正确语句是( ) A. fp=fopen( "hello.txt ","r" ) B. fp=fopen( "hello.txt ","ab+" ) C. fp=fopen( "hello.txt ","w" ) D. fp=fopen( "hello.txt ","r+" )

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出自：兰州理工大学C语言程序设计a

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