Question

【题目】I was so sleepy that I didn't know when the alarm clock________.

A.ran offB.went offC.took offD.put off

Answer 1

【答案】B

【解析】

句意：我太困了，不知道闹钟什么时候响的。

考查动词短语。ran off流失；went off发出响声；took off脱下，起飞；put off推迟；根据句意理解可知，这里表达的是“闹钟发出响声”，故选B。