During the days---,he wrote five articles about Iray war.

that指代days,没有that后面的follow就缺主语啊～所以说一定要that 要多注意句子的成分的完整 定语从句 follow这里作不及动词 the days that followed =the following days (B)B 项中的that是定语从句的关系代词,这里指代的是days the days that followed =the following days that followed