It has been a lesson to mankind that immediate action must be taken the moment some new virus____.A.is happened B.will happen C.happens D.would happen

It has been a lesson to mankind that immediate action must be taken the moment some new virus____.A.is happened B.will happen C.happens D.would happen It has been a long time.Are you ok? it has been a long time. what is up It has been there since a t_ years ago . It is a week since he has been to BeiJing. it has been a fantastic trip 怎么翻译 it has been since.用法 It has been in my it is/has been= It's has been accepted it has long been assumed 英语翻译Revealing the effect of teaching the subject of direct current through analogy method on science students’ attitudes towards physics lesson has been aimed in this research.In the end of the research it has been determined that there are ------work has been done,has it?A.few B.a few C.little D.a little 英语翻译Take it easy,this is a travel article,not a history lesson.World War II has been over for 67 years and there really is no need to bring it up on every possible and impossible occasion.Try to enjoy an article that paints a positive picture It was the second time that he _to Europe A has been B had been It ____ ever since 1924. A.has been broadcast B.has been broadcasting C.has been broadcasted请速速速速速速回答案，真的很急急急急急急。 Our school is a new one,it _____ for 5 years.A.has openedB.has openC.has been openD.has been opened Hi there,It has been brought to our attention by a constituent,that your group has been using the