The reason ______ he was late was unknown

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Thereason______hewaslatewasunknownThereason______hewaslatewasunknownThereason______hewaslatewasunkno

The reason ______ he was late was unknown
The reason ______ he was late was unknown

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