People have been using fire for well over a million years.可否改成：People have used fire for well over a million years.

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 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 请问 Has been like the other people who like to have been如何翻译 翻译：i have a hard time even recoginzing people i have been introduced to. 是has还是have?A lot of advice has/ have been offered by people?advice不可数 I have been meeting a lot of people that way为什么不直接I have met many people have probably been mad at our friends.改:many people have probably been____ _____ our friends. have been have been have been have been 首字母填空,For some time,people have been wond首字母填空,For some time,people have been wondering what u___ can be made of the material.