A huge amount of oil was spilt on the East Sea, the causes of ______ are still under investigation.
#78658
A
it
B
that
C
which
D
whom
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He was very rude to the customs officer, ____ of course made things even worse.
#78719
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is recorded in the history book , Diaoyu Island has belonged to China since ancient times.
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A huge amount of oil was spilt on the East Sea, the causes of ______ are still under investigation.
#78658
A
it
B
that
C
which
D
whom