The reason ______ he was late was unknown
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The reason ______ he was late was unknown
that
why
reason 做原因状语
why 他迟到的原因还是未知
定语从句 缺少关系副词 表示原因 用Why
The reason ______ he was late was unknown
that
why
reason 做原因状语
why 他迟到的原因还是未知
定语从句 缺少关系副词 表示原因 用Why