题目内容

以下关于循环结构语句的机器级代码表示的叙述中，错误的是（）。

A. 一定至少包含一条条件转移指令
B. 不一定包含无条件转移指令
C. 循环体内执行的指令不包含条件转移指令
D. 循环结束条件通常用一条比较指令CMP来实现

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