A
后半句为一个围绕function的定语从句,AB中的which都指代function,这样一带进去A就很通啦哦~
如果选B,them又指什么呢?所以不通啦!
C ,of后面应该接名词,它没有
D更怪一些
The medicine has many functions,__are unknown to us.
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