组卷网 > 高中英语综合库 > 语法 > 句法 > 复合句 > 状语从句 > 时间状语从句
题型:单项选择 难度:0.85 引用次数:561 题号:8209052
One of the true tests of leadership is the ability to recognize a problem ________ it becomes an emergency.
A.whenB.before
C.afterD.unless
【知识点】 时间状语从句解读

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