He has written many books,two of them are widely read.错在哪 为什么

错在“two of them”,这是两个句子,不应有逗号.该句子有两种改法：1 将“two of them”改为 “two of which”2 “two of them”的话,就 改成并列的两个句子He has written many books,and two of them are widely re...