1 首先,你的句子的正确表达是：
Both of the( two) girls are new to me.或者是：Both girls are new to me.
2 答案是 C either.
not either ------用于“两者之间”.not any ------用于“三者或三者以上”.
所以,答案是 I don't know either of them == I know neither of them.选A可不可以不可以。在这里both的解释是“并非两个都- - - - ”。