根据上句完成下句 The reason why the boy was often late for school is still unknown
The reason( )( )the boy was often late for school is still unknown
人气：262 ℃ 时间：2020-05-22 06:45:49
解答
填 for which.定语从句中介词+关系代词可以相当于一个关系副词.关系副词why指原因.介词for也可以表原因,所以why相当于for which.
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