题目内容

文本文件 f.txt 中原有内容为：good，运行下列程序后，文件 f.txt 中的内容为（）。#includeint main(void){ FILE *fp;fp1=fopen("f.txt", "a");fprintf(fp, "abc");fclose(fp);return 0;}

A. goodabc
B. abcd
C. abc
D. abcgood

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