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【题目】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】试题解析:这个是一个定语从句,根据对句子意思的理解,可知先行词为逗号前的整个句子,非限制性定语从句,故用which。应选C

句意:大量的石油在东海上泄漏了,其中的原因还在调查中。

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