I have promised to have the work finished by the end of this

題目：

I have promised to have the work finished by the end of this week
翻譯：我已經答應 本周末完成這項工作了
我怎麼覺得這句 是 一個現在完成時嵌套在另一個現在完成時里?
解釋解釋這個句子~
還有 have the work finished 爲什麼不是 have finished the work ?

解答：

have sth done並不是完成時,而是一個結構,這個結構的是表示"使某事被做"的含義