The air in big cities ______ very dirty by factories.A.are often made B.is often made C.have often made D.has often made我想选b,可答案为什么给c啊,我觉得d都比c好

The air in mountain areas is _that in big cities 该作文的翻译,这样翻?Do the teenagers in small villages do chores at home?How about the teenagers in big cities?Here is a survey.We asked 4000 teenagers in China several questiona.Half of them come from big citie There is more and more air __(污染)in the big cities .填什么形式 in the open air stick in the air in the air是什么意思 in the air on the air 英语翻译In some big cities,little is done to make the smoke clean before it goes into the air. Shanghai is one of the most famous cities in the world.回答：Shanghai is_____the most famous citie.（填一个单词） 辨析 in the air,on the air,in air,on air In some big cities,little is done to make smoke clean before it goes into the air. in the open air造句 catch bubbles in the air In the Air意思是? castles in the air是什么意思 In The Air Tonight 歌词 love isdefintely in the air. Love's In The Air