1.The flowers ____ sweet in the botanic garden attract the visitors to the beauty of nature.
A.to smell B.smelling C.smelt D.to be smelt
2.Wind ____ electricity ____ in our life.
A.is used to produce ; make a difference
B.is used to producing ; to make a difference
C.used to produce ; makes a difference
D.used to produce ; made a difference
3.A board ____ by the side of the wall on which these words ____,"Danger!Keep off!"
A.set up ; wrote
B.put up ; wrote
C.has put up ; are written
D.was set up ; were written
要有分析啊，谢谢
1.B smell的意思“闻起来”花闻起来芳香，是主动。所以用现在分词smelling作定语.
2.C 风被用来发电 ，所以用过去分词作定语。makes a difference是整个句子的谓语动词。
3.D 牌子被立起来 these words 被写到牌子上
1.B 这里是现在分词左后置定语
2.C 前面是后置定语，后面是整个句子的谓语，一般现在时
3.D 表被动，前半句是主句，后半句是从句
1. B 主谓结构 用动名词 花+ 散发
2. B is used to 被用来做.... 后面 是 动词不定式 to 作宾语
3. D 被动语态
1.B 闻起来
2. A be used to do 被用来做……
3.D 被建立，树立 被写
1 C smelt 过去分词做定语
2 C used to produce 过去分词做定语 该句是一般陈述句 用一般现在式
3 D was set up 竖立的意思 后面on which是定语从句 还原后是 these words were written on the wall.
C， 定语从句的省略。that are smelt ，that are 可以省略
C。定语从句， wind (that is) used to produce,,,,,,,makes,,.......... 括号里的可以省略，和上一个类似、be used to do sth 被用来做。。 be used to doing 习惯于做某事 used to do sth 过去常常做某事。
D 被动语态， by 很明显