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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beingbuilt以及tobebuiltbeingbuilt
题目内容：
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优质解答
to be built是将来时态,to be done表将来
being built 正在建
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
优质解答
being built 正在建
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