单项选择题
A.do {break;}while(条件);B.while(条件){break;}C.for(初值;条件;增量){break;}D.main(){break;}
A.没有输出B.1C.123D.12
A.do {continue;}while(条件);B.while(条件){continue;}C.for(初值;条件;增量){continue;}D.switch(表达式){continue;}