The language lab_____(build) when I stayed there a few months ago.

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The language lab_____(build) when I stayed there a few months ago.

The language lab_____(build) when I stayed there a few months ago.
The language lab_____(build) when I stayed there a few months ago.

The language lab_____(build) when I stayed there a few months ago.
was built
被动语态 的过去式

The language lab_were built____(build) when I stayed there a few months ago.

had been built 过去的过去,用过去完成时