Question

一道英语题，考点，我想知道为什么B错，选c，and的用法不用解释，只要解释which和them

China has hundreds of islands, ___________ is Taiwan Island.
A．among them the largest B．and the largest of which
C．and the largest of them D．but in which the largest

Answer 1

其实我认为这里的标点符号是在误导你。如果用了them的话，这句句子就根本不是从句了。这样就没有语法可言啊。
也许就是因为有and 的存在的问题，导致逗号前后两句句子是并列的没有主从的关系，这样你就不用which来表示了

Answer 2

首先,这是个非限制性定语从句,只能用关系词which,其次,三者或三者以上要用among.

Answer 3

B也是对的。

英文维基百科的一句话：
They also built large earthen mounds, the smallest of which were used for agriculture or housing, and the largest of which had ceremonial functions.

句中 which = them = islands