doctors have been transplanting hearts for some time啥意思?

doctors have been transplanting hearts for some time啥意思? have been they have been doctors中been后直接加名词doctors.那为什么have been to China中必须加to等介词才能加名词China? i have been finishing up my volunteer work for doctors without borders翻译 There have been a lot of ____in our city since 1990.A.woman doctors B.woman doctorC.women doctor D.women doctors I have just been to I have got a bad cold A.the doctor B.the doctor's C.the doctors D.doctor's TR 英语翻译Doctors have to…… have been have been have been have been have effect on中effect可提前?如何提前?eg doctors have been reserching what effect stand--up and other forms of comedies have on us 中effect提前了，为什么？急用........ 英语翻译Nowadays,stand-up comedy is popular all over the world.Doctors have been researching what effect stand-up and other forms of comedy have on us.What they found is surprising.Doctors have discovered that people who laugh a lot live longer!T 英语基础训练,感激不尽1My parents are doctors._____of them enjoy traveling ,but____likes going to the movies.2l have three uncles.____of them work in foreign countries,but_____of them wants to live abroad after they are retired.3There are tr More than 100 doctors and nurses in the hospital __ to the disaster area after theearthquake happened.A.are sent B.would be sent C.were sent D.have been sent为什么不选B, 高中英语单选In order to save the brave driver,doctors 空格 all they can over the past 7 yearsA,didB,have been doing C,had done D,were doing是7 hours,不是年= = 请哪位大哥大姐帮小弟翻译一下For a couple of millennia now, doctors have been taking a pledge. Imagine if, instead of following the Hippocratic Oath, doctors only focused on the wealth to be had from cosmetic surgery… or shaking down d 翻译：I have twosisters,both of whom are doctors.