【題目】A huge amount of oil was spilt on the East Sea,the causes of ________ are still under investigation.

A.itB.thatC.whichD.whom

【答案】C

【解析】試題解析:這個是一個定語從句,根據(jù)對句子意思的理解,可知先行詞為逗號前的整個句子,非限制性定語從句,故用which。應選C。

句意:大量的石油在東海上泄漏了,其中的原因還在調(diào)查中。

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