【单选题】

The medicine has many functions,______are unknown to us.

A、some of which
B、that some of them
C、of which some of them
D、which of them

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根据网考网移动考试中心的统计，该试题：

62%的考友选择了A选项

16%的考友选择了B选项

16%的考友选择了C选项

6%的考友选择了D选项