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 AhugeamountofoilwasspiltontheEastSea,thecausesof

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問題詳情:

 AhugeamountofoilwasspiltontheEastSea,thecausesof

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

A. it                B. that         C. which            D. whom

【回答】

C

知識點:定語從句

題型:選擇題

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