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

解析試題分析：考查定語從句。本題考查的是非限制性定語從句，which指代前面一句話的內(nèi)容，在從句中做主語。句意：很多科學家都認為宇宙起源于宇宙大爆炸，這是發(fā)生在137億年前的事情了。That不能引導非限制性定語從句，when在句中不能做主語；what不能引導定語從句。故B正確。
考點：考查定語從句
點評：定語從句的關鍵是分析句子成分，如果定語從句的句子成分很完整就使用關系副詞；如果句子缺少主語，賓語，表語或者定語的時候就使用關系代詞。同時也要注意一些關系詞的特殊用法，如whose，that，which等。Whose是關系詞中唯一的一個可以放在名詞前面做定語的關系代詞，如果缺少定語，用whose引導定語從句，或是of which the+名詞/the+名詞+of which。要特別注意which引導非限制性短語從句的用法。

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