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

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(xué)家都認(rèn)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(dǎo)非限制性定語從句,when在句中不能做主語;what不能引導(dǎo)定語從句。故B正確。
點(diǎn)評:定語從句的關(guān)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(guān)系副詞;如果句子缺少主語,賓語,表語或者定語的時(shí)候就使用關(guān)系代詞。同時(shí)也要注意一些關(guān)系詞的特殊用法,如whose,that,which等。Whose是關(guān)系詞中唯一的一個(gè)可以放在名詞前面做定語的關(guān)系代詞,如果缺少定語,用whose引導(dǎo)定語從句,或是of which the+名詞/the+名詞+of which。要特別注意which引導(dǎo)非限制性短語從句的用法。
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