◎ 题干
A huge amount of oil was spilt on the East Sea, the caused of ______ are still under investigation.

[     ]

A. it
B. that
C. which
D. whom
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“A huge amount of oil was spilt on the East Sea, the caused of ______ are still under investigation. [ ]A. it B. that C. which D. whom …”主要考查了你对  【关系代词】【非限制性定语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。