问题
选择题
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
答案
答案：C
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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
答案：C