The medicine has many functions, ______ are unknown to us.A、some of whichB、of w

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问题 The medicine has many functions, ______ are unknown to us.

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

答案 A

解析逗号后面是非限定性定语从句，由which引导，which指代functions，同时作从句的主语，此处which前有限定词some of。句意：这个药有许多作用，其中有一些是不为我们所知的。

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