They .[build] three new huose by the end of last year的空应填什么

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They .[build] three new huose by the end of last year的空应填什么
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They .[build] three new huose by the end of last year的空应填什么
They .[build] three new huose by the end of last year的空应填什么

They .[build] three new huose by the end of last year的空应填什么
had built

had built
by the end of last year(到去年底),提示用过去完成时