in the days the students were kept busy collecting information to write the reportIn the days____,the students were kept busy collecting information to write the report.A.to be followed B.that followed C.follow D.to be following为什么选B?A为什

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in the days the students were kept busy collecting information to write the report
In the days____,the students were kept busy collecting information to write the report.
A.to be followed B.that followed C.follow D.to be following
为什么选B?A为什么不可以?

不定式表示将来的时间(事情将会发生),原文描述的事实已经是过去了