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【单选题】
C 语言中 while 和 DO......while 循环的主要区别是 ( )A.
DO......while的循环体至少无条件执行一次;
B.
DO......while允许从外部转到循环体内;
C.
DO......while的循环体不能是复合语句；
D.
DO......while的循环体不能是复合语句。
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