【单选题】【消耗次数：1】
while循环语句中，while后一对圆括号中表达式的值决定了循环体是否进行，因此，进入while循环后，一定有能使此表达式的值变为( )的操作，否则，循环将会无限制地进行下去。
①
0
②
1
③
成立
④
2
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