Although ____ thirty years ago,the house looks very beautiful.(build)答案上给的是 built我不明白为什么不能填 to be built或being built以及 to be built being built

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Although____thirtyyearsago,thehouselooksverybeautiful.(build)答案上给的是built我不明白为什么不能填tobebuilt或beingbui

Although ____ thirty years ago,the house looks very beautiful.(build)答案上给的是 built我不明白为什么不能填 to be built或being built以及 to be built being built
Although ____ thirty years ago,the house looks very beautiful.(build)
答案上给的是 built
我不明白为什么不能填 to be built或being built
以及 to be built being built

Although ____ thirty years ago,the house looks very beautiful.(build)答案上给的是 built我不明白为什么不能填 to be built或being built以及 to be built being built
to be built是将来时态,to be done表将来
being built 正在建

Although _the house_was built__ thirty years ago,这局话是有省略,为了让句子简洁

这是一个省略句,省掉了主语和部分谓语动词( the house was)!

这是关于非谓语动词的用法。to be built用在将来时,表示“将要被建”;
being built则表示“正在被建”。
而且这个句子中“thirty years ago”是过去的某个时间,built是表示“过去被建”,符合语法的要求,所以用built。