Expert have been warning-----of the health risks caused by passive smoking.A.at a time B.at one time C.for some time D.for the time 应该选什么,为什么,它们各是什么意思?

The two countries ______with each other for several years.A was on war B was at war C have been on war D have been at war 英语翻译The fundamental patterns of inequality have remained and have been accentuated by the war How many times have the Olympic Games been stopped because of war? Experiments of this kind____in both the U.S.and Europe well before the World War.A.have conducted B.have been conductedC.had conducted D.had been conducted after world war 2 ,technological___ in various fields have been madea.advances b.progresses c.drawbacks d.disadvantages This place ( )during the War 2.A.was not conqueredB.have not been conqueredC.had not been conqueredD.did not conquered选什么为什么 have been have been have been have been 英语翻译War and PeaceGenerally,war is repugnant,but peace is welcome.While peace is the ultimate goal of all of our undertaking in this world,war has been inevitable in the course of human civilization.Does man have an innate taste for war?Or is 英语翻译Even if the civilian population at home had wanted to know the war,they couldnt' have without experiencing them.The war would have been simply unbelievable.主要是这里的couldnt' have without experiencing 和后面的would have been Expert have been warning-----of the health risks caused by passive smoking.A.at a time B.at one time C.for some time D.for the time 应该选什么,为什么,它们各是什么意思? 定语从句Here is one of the most interesting novels that ( ) been published since the war.A.have B.has选哪个,为什么. 英语翻译Millions of people now have seen the effects of a battle.And the result has been a general dislike of war One of the prisoners escaped in the war claimed____in prisonA,unfairly treated B,treateing unfairly C,to be treated unfairly D,to have been unfairly treated war war