Besides wildlife on land, there are species living in the oceans we still know little.
A. about which
B. in which
C. for which
D. with which
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(答案→)A. about which
B. in which
C. for which
D. with which
解析：句意：除了陆地上的野生动物，海洋中还有一些我们知之甚少的物种。这个句子中包含一个介词+关系代词引导的定语从句，know about是固定用法，意思是知道，了解，选A。