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
【正确答案】
A
【答案解析】
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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