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The medicine has many functions,__are unknown to us

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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 whcih of them
A,some of which
The medicine has many functions, some of which are unknown to us.
医药功能很多,其中一些功能对我们来说是未知的.
some of which引导定语从句
some of which 等同 some of them
因此,B多了that
C多了of which
D语义不通