执行以下程序后,test.txt文件的内容是【 】。(若文件能正常打开)#includemain(){FILE * fp；char*sl="Fortran",*s2="Basic"；if((fp=fopen("test.txt","wb"))==NULL){printf("Can’t open test.txt file＼n")；exit(1)；}fwrite(sl,7,1,fp)；／*把从地址sl开始的7个字符写到fp所指文件中*／fseek(fp,0L,SEEK_SET)；／*文件位置指针移到文件开头*／fwrite(s2,5,1,fp)；fclose(fp)；}

A．Basican

B．BasicFortran

C．Basic

D．FortranBasic