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

问题描述:

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

was built
被动语态 的过去式为什么不是was being builtfew months ago 是过去的时间点,不是时间段时间点也可以用过去进行时的不是吗?就像I was doing homework when my mother came insorry,确实。 如果没有上下文,好像 was being built 和 was built 都可以