There are some creatures living in the depths of the ocean,_______ we know little.  A.of which B.where C.by which D.that

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There are some creatures living in the depths of the ocean,_______ we know little.  A.of which B.where C.by which D.that
There are some creatures living in the depths of the ocean,_______ we know little.
  A.of which B.where C.by which D.that

There are some creatures living in the depths of the ocean,_______ we know little.  A.of which B.where C.by which D.that
答案:A.本题考查非限制性定语从句.由题干可知,定语从句we know little,句子不完整(此处缺少宾语),则排除选项B(关系副词不能作宾语);先行词是“There are some creatures living in the depths of the ocean”这件“事”,即先行词“指物”,代入定语从句中,即we know little of/about sth.,这样由which代替先行词,即选项A符合题意.选项C介词不与know连用;选项D不可用于非限制性定语从句中;句意:有些生活在海洋深处的生物,我们对其知之甚少.