6. 以下程序: main( ) { char s1[40]="country",s2[20]="side"; int i=0,j=0; while(s1[i]!='\0') i++; while(s2[j]!='\0') s1[i++]=s2[j++]; s1[i]=0; printf("%s\n",s1); } 的输出结果为()
A. side
B. country
C. sidetry
D. countryside
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