People have been used to _______ business cards with each other when they first meet.1 exchange 2 exchanging 3 change 4 changing

请翻译：For some time people have been wondering what use can be made of material. 请问been的具体用法比如have been,had been,been in use（前加什么后加什么?）been用在什么句子中?比如这句话：The people in the UK____(set up)to help poor people.Yes.Oxfam____(set up)to help poor people.这两句话中的set people who是has been还是have been there have aways been people 正确么?there have aways been people 和there has aways been people哪个正确? Society's people have been now realistic,what people the software have been explicitly designed for use by outsiders.the software have been explicitly designed for use by outsiders. 英语翻译While at the same time they have been made easier to use.As a result,their popularity.Has been increasing as more and more people have been buying computers for their homes and business.Computers have been designed to store information an People often use forks and k____when they have meals. we have to use please to make people h____ I （ ）more shocked when i heard about you engagementA could have been b,might have been c .couldn't have been d.might not have been2.Land is ( ) valuable today .people use every bit of it and don't want travellers on their landa ,.such b those c n more and more people ___how to use computers from now on?more and more people ___how to use computers from now on because they have found internet so amazing to them.a learn b will learn c have been learning d leant 选哪个,为什么? research for ...scientists have long been doing research_______he brain to help people make better use of it.这里的答案是 on我记得好像有个research for 有没有这个词? 英语翻译 people have been visiting it for many years. sensitive people have been mirroring their friends all their life. many people have been made homeless句中 people who have once been poor这句话啥意思? mang trees have been planted by people themang trees have been planted by people these years改主动语态 （合并句子） ICQ is a chatline.People use ICQ to have conversations.（合并句子）ICQ is a chatline.People use ICQ to have conversations.People use ICQ ________ ________ _________ _________ to have conversations.