____ by air pollution,acid rain ____ spread everywherea.Caused; has b.To be caused; has 为何选A,B错在哪?

英语倒装句子1.we did not know much about global warming until watched the Earth Day programme on TV ..以Not until...开头做倒装2.we can save the earth only by learning to live in harmony with nature .以only开头3.I knew that air pollutio He went to london by air 改为同义句 改为 He ____ ____ ____ to London (with air /in air /by air ./through air) by air造句 by air是什么意思 By air 合适么? 做火车旅行比做飞机旅行便宜得多 ____ by train is ___ ___ than by air. Mr.Hill will go to America by air.同义句改写Mr.Hill will ____ ____ America. Travelling by air may be ____,but not so ____. 答案是quicker cheap 求解释为什么不用cheaper？ my mother went wo Beijing with robot by air.(同义句转换） my mother ____ ____ Beijing with robot. by the air or by air如题,哪个对? Judy went to Australia by air last year.（保持原句意思不变）Judy ____ _____Australia last year ____going to England by air next week.Thank for your help(同义句）Thank you ____ ____me Could I ____ the table by the air-conditioner? 坐靠近空调的桌子 中间什么词? 句型转换①she will go to another city by air（改为同义句）①she will go to another city by air(改为同义句)she will ____ ____ another city②do you thishe will go to another city by air（改为同义句）do you think you _____ ____ ____ by air pollution,acid rain ____ spread everywherea.Caused; has b.To be caused; has 为何选A,B错在哪? Mr Black went to Washington DC by air last Monday(改为同义句）Mr Black ____ ____ Washington DC last Monday with air in air by air throght air 哪个是fly的意思?急急急!