while 和 do-while 循环的主要区别是     

A、<span style="font-size:16px;font-family: &#39;Times New Roman&#39;,&#39;serif&#39;">do-while</span><span style="font-size:16px;font-family:宋体">的循环体至少无条件执行一次</span>

B、<span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">&nbsp;while</span><span style="font-size:16px;font-family:宋体">的循环控制条件比</span><span style="font-size:16px;font-family:&#39;Times New Roman&#39;,&#39;serif&#39;">do-while</span><span style="font-size:16px;font-family:宋体">的循环控制条件严格</span>

C、<span style="font-size:16px;font-family: &#39;Times New Roman&#39;,&#39;serif&#39;">do-while</span><span style="font-size:16px;font-family:宋体">允许从外部转到循环体内</span>

D、<span style="font-size:16px;font-family: &#39;Times New Roman&#39;,&#39;serif&#39;">do-while</span><span style="font-size:16px;font-family:宋体">的循环体不能是复合语句</span>