I overslept this morning because my alar...

I overslept this morning because my alarm clock ______.

A．didn’t go out	B．didn’t let out
C．didn’t go off	D．didn’t let off

C 【解析】试题分析：短语辨析：go out熄灭；外出；go off（警报器）突然大作; let out释放，发出；let off下车，引爆；句意：今天上午我睡过了。是因为我的闹钟没有响。根据句意说明C正确。考点：考查短语辨析

考点分析：

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