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I have a lot of good friends,are engineers.

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I have a lot of good friends,are engineers.
I have a lot of good friends,are engineers.
a.some of them b.some of which c.some of whom d.some of that
求正确答案及为什么
选C.逗号不能连接两个句子,所以本句为定语从句,排除A.有逗号,所以是非限制性定语从句,排除D(非限制性定语从句关系词不能用that).再看先行词是good friends,指人,所以排除B(先行词是物,关系词用which;先行词是人,关系词用who).