they are offices.怎样改单数句

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theyareoffices.怎样改单数句theyareoffices.怎样改单数句theyareoffices.怎样改单数句Itisanoffice.

they are offices.怎样改单数句
they are offices.怎样改单数句

they are offices.怎样改单数句
It is an office.