People should have taken steps to stop this happening,but they___a.didn't b.haven't 选A B怎么排除的

Should people have cosmetic surgery? WE SHOULD RESPECT food and think aboutWe should respect food and think about the people who don’t have what we have here and treat food nicely意思 分析一个题目的句子结构We should respect food and think about the people who don’t have what we have here and treat food nicely People should have taken steps to stop this happening,but they___a.didn't b.haven't 选A B怎么排除的 People should have taken steps to stop this happening,but they___a.didn't b.haven't 选A B怎么排除的 i should don't have pushed it Most citizen think that the government -----the food standard,putting people's health atrisk . A can have lowered Bmustn't have lowered C should have lowered D shouldn't have lowered people should wash their hands ( )they have meals should people have surgery to make themselves more beautiful? 求文档: Young People Should Have Combatant Spirit 翻译：A teacher should have broad experience with young people If I would have listened to those people .27.If I would have listened to those people who told me I couldn’t do it then.,today ____ just be Saturday.A will B.shall C.would D.should 英语翻译句子的意思We should respect food and think about the people who don't have____we have here and treat food nicely . We should respect food and think about the people who don’t have_______ we have here and treat food nicely.A.that B.which C.what D.whether People should be good______wild animals.Don't scare them______. Some scientists t( ) that people should also take catnaps. should have done ,shouldn't have done.could have done,couldn't have done 1.Mr.White ______ at 8:30 for the meeting,but he didn’t’ show up.选项:a、should have arrived b、 should arrivec、 should have had arrived d、 should be arriving2.People around the world are becoming more and more ____ about the population e