题目内容

Burglar alarms ________ at any time of the day or night serve only to annoy.
A．go offB．that go off
C．that are going of D．which going off
Ｂ

试题分析：考查定语从句。本题定语从句的先行词是Burglar alarms，that引导起该短语从句，并在句中做主语。AD项不是一个完整的句子，C项的时态错误。句意：在在白天或者晚上警铃声音只会让人很恼怒。故B项正确。
点评：定语从句的解题关键在于分析句子成分，如果句子很完整就使用关系副词，如果句子里面缺少主语，宾语，表语或者定语的时候，就使用关系代词。同时要注意定语从句的句意的完整性。
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