问题
选择题
There are species living in the depths of the oceans ________ we still know little.[ ]
A. in which
B. where
C. of which
D. of what
答案
答案：C
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There are species living in the depths of the oceans ________ we still know little.[ ]
A. in which
B. where
C. of which
D. of what
答案：C