题目内容

18．It was 5o'clock ______ the front doorbell opened..（　　）
A．thatB．whenC．whatD．in which

分析 五点时，前面的门铃响了．

解答 答案：B句中the front doorbell opened不能构成对5 o'clock的修饰或强调，不是强调句型或定语从句；it指时间，是句子的主语；the front doorbell opened在句中作时间状语，是一个状语从句，意思是当前面的门铃响时，当时的时间是五点．故选B．

点评 时间状语从句是副词性从句的一种，在句中作时间状语，修饰句子的谓语或整个句子内容．

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