一道英语单选!During the week____he tried to collect materials for his article.

一道英语单选!During the week____he tried to collect materials for his article.
选项 A following B followed C to follow D that followed
这题的答案是D
但是that followed不是可以用following替换吗?是现在分词的用法
如This is the book that makes me happy.
等于This is the book making me happy.
是不是用现在分词代替that从句时,句子成分必须完整?