He usually____(reach) his office before seven o'clock. reach怎么变形原因

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He usually____(reach) his office before seven o'clock. reach怎么变形原因
He usually____(reach) his office before seven o'clock. reach怎么变形
原因

He usually____(reach) his office before seven o'clock. reach怎么变形原因
reaches
主语是“he”,时态根据“usually”判断是一般时,所以用单三形式:reaches