- With the help of high technology, more and more new substances _____ in the past years.A. discoveredB. have discovere...
- Though we don't know what is discussed, yet we can feel the topic _______.A. had changedB. will changeC. was changedD...
- In recent years many football clubs _____ as business to make a profit.A. have runB. have been runC. had been runD. w...
- More patients _____ in hospital this year than last year.A. treatedB. have treatedC. had been treatedD. have been tre...
- — The window is dirty.— I know. It _____ for weeks.A. hasn't cleanedB. didn't cleanC. wasn't cleanedD. hasn't been cl...
- When and where to enjoy our summer vacation _____ yet.[ ]A. aren't decidedB. isn't being decidedC. hasn't been decide...
- The song You and Me _____ on the radio since August 2008, so I can sing it.A. playedB. is playedC. will playD. has be...
- After years of efforts, Chinese Olympic dream _____ in the end.A. comes trueB. has been come trueC. has been turned i...
- Millions of RMB yuan's worth of damage to the environment ______ by the poisonous chemicalthat flew into the river.[ ...
- — Why do you look so worried?— My computer broke down and my essay _____ since.[ ]A. has been left unfinishedB. has l...
- All the students are excited about the good news that next Sunday we will go camping. Butwhen and where to camp _____...
- — Will you attend the meeting this afternoon?— But I ________ anything about that.[ ]A. hadn't been toldB. haven't be...
- Every necessary means____ to protect milu deer which____ very valuable to us. As a result,the number of milu deer is ...
- This is the first time that I_____ to give a lecture to so large a audience till now.[ ]A. am invitedB. have invitedC...
- I _______ you for sixteen years and I still don't know what goes on in your mind.[ ]A. have marriedB. have got marrie...