I don't know (some)of these people, for they are new clerks.否定句中不是应该用any吗？而且any也有任何一个的意思
还是一道选择题。呵呵！谢谢大家的指导！

Question

Answer

I don't know some of these people = I don't know all of them.
There are some she knows, and there are some she doesn't know.

The sentence isn't "very good" grammar. Correct would be:
There are some I don't know, because these clerks are new.