问题
单项选择题
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
答案
参考答案：A
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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．which of them
参考答案：A