pollution has become a worldwide problem,it may be many years ( )the situation improvesA.after B.before C.as D.since为什么

today pollution has become a seriously problem on earth. Air pollution has become the biggest (o ) inthe city now.这是缺词填空 英语翻译想说是否细颗粒问题已经成为了一个很大的环境问题＂,写成＂Has particulate matter pollution become a serious environmental problem?对吗 Th problem which the air pollution in cities has become more and more serious.这个句子用which 还是只能用of pollution has become a worldwide problem,it may be many years ( )the situation improvesA.after B.before C.as D.since为什么 he has become a What's wore is that pollution has Once these,has become the When loneliness has become a English has become the national it has become 怎么用 英语翻译nantong has become [ ] [ ] [ ] kites [ ] [ ] [ ]. The public has been warned of the danger of pollution. The pollution problem in this area ___(become) worse and worse . 首字母填空.Animals are people's friends.But many wild animals are f___ the danger of dying out,because theenvironment that they are living in has changed greatly.For example,their living area has become smallerand smaller because of pollution an I` love has now become a My love for you has become a She has just become motherless同义句