四六级考试

试题来源：大学三级(A)-267
【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

参考答案：A
网考网解析：
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... 查看试题解析出处>>