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【单选题】
下列关于文件的叙述中，错误的一条是______。
A.
在随机访问模式下，文件中的每条记录的长度可以不同
B.
在对文仆进行任何操作之前，必须事先打开文件
C.
LOF()函数返回文件的字节数，如果返回0，表示该文件是一个空文件
D.
在二进制访问模式中，可以把文件指针移到文件的任何地方
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