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?
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?
问题解答：
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