During the week()he tried to collect materials for his article.

问题描述:

During the week()he tried to collect materials for his article.
为什么用that followed而不用followde呢

That followed 是一个定语从句,修饰week,
可以改成During the following week he tried to collect materials for his article.
表示,接下来的那个心星期,他试图为他的论文收集材料.