单选题：下面的程序执行后，文件file.txt中的内容是

下面的程序执行后，文件file.txt中的内容是

void fun(char *fname, char *st);

int main(void)

{

fun("file.txt", "How are you!");

fun("file.txt", "Fine, thank you!");
return 0;

}

void fun(char *fname, char *st)
{

FILE *fp;
int len, i;

fp = fopen(fname, "w");
if (NULL == fp) { printf("file open error!"); exit(1); }

len = strlen(st);
for (i=0; i fclose(fp) ;
}



A.file.txt
B.How are you!
C.How are you!Fine, thank you!
D.Fine, thank you!


答案：D