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Many scientists believe that the universe began with an enormous explosion called the “Big Bang”, ______ happened about 13.7 billion years ago.
A.thatB.whichC.whenD.what
B

试题分析:考查定语从句。本题考查的是非限制性定语从句,which指代前面一句话的内容,在从句中做主语。句意:很多科学家都认为宇宙起源于宇宙大爆炸,这是发生在137亿年前的事情了。That不能引导非限制性定语从句,when在句中不能做主语;what不能引导定语从句。故B正确。
点评:定语从句的关键是分析句子成分,如果定语从句的句子成分很完整就使用关系副词;如果句子缺少主语,宾语,表语或者定语的时候就使用关系代词。同时也要注意一些关系词的特殊用法,如whose,that,which等。Whose是关系词中唯一的一个可以放在名词前面做定语的关系代词,如果缺少定语,用whose引导定语从句,或是of which the+名词/the+名词+of which。要特别注意which引导非限制性短语从句的用法。
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