in the days the students were kept busy collecting information to write the report
问题描述：
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?
答
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