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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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