【多选题】【消耗次数：1】
先判断循环条件后执行循环体语句的循环结构有（）。
①
while循环结构
②
do...while循环结构
③
for循环结构
④
while...do循环结构
参考答案：
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相关题目
【单选题】
在 DO WHILE … ENDDO循环结构中 ,EXIT 命令的作用就是
①
退出过程 , 返回程序开始处
②
转移到 DO WHILE语句行 , 开始下一个判断与循环
③
终止循环 , 将控制转移到本循环结构 ENDDO后面的第一条语句继续执行
④
终止程序执行
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