I overslept this morning because my alarm clock .A. didn’t go outB. didn’t let outC. didn’

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A. didn’t go out
B. didn’t let out
(答案→)C. didn’t go off
D. didn’t let off
解析：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。