三道英语题目，麻烦各位哥哥姐姐帮助一下

三道英语题目，麻烦各位哥哥姐姐帮助一下
1.Mitchell Joachim,an architect from the Massachusetts Institute of Technology,pictures a day___when__will be created from living trees.
麻烦翻译一下
2。It seemed only several minutes_____he made up his mind and told us his decision.
A after B before C when D until
为什么选B？？？我觉得A与D也可以
3.Barcelona is famous,among other things,___its outstanding architecture.
A as B for C of D to
为什么选择B??我选的是A