7.All possible means __________ to save the hero.A.has tried B.have tried C.has been tried D.have been tried

7.All possible means __________ to save the hero.A.has tried B.have tried C.has been tried D.have been tried all possible means has been tried,but has any effect.all possible means has been tried,but() has any effect.A.no any one B.neither C.none D.either 应该选哪个答案.为什么啊. All possible means have been tried to ()the flu.a.treat b.deal c.cure d.operate the fact is that we've employed all possible means to get you even these 800cases 英语means考察means单复数同型,易考察主谓一致1.All possible means have been tried,but not a *mean* has works. 第二个*mean*还加s吗?2.by means of是什么意思? all things are possible If at all possible Rome,by all means by all means by all means by all means All means that _____ possible _____ been used to save himA.is; have B.were; have C.was; has D.are; hasB.为什么? 请教个语法知识.我英语语法很差.1、Every possible means has been tried,but none worked.2、All possible means have been tried,but none worked.为什么第一句中用has been ,第二句中用have been、?请分析下,另外been前加has/ 词义辨析By means of.by no means.by this means.by all means every possible means 是用单数还是复数 Impossible means I am possible是什么意思麻烦解答,谢谢! by no means和by all means的意思 i am not sure whether i will succeed in persuading her.____,i will try all possible means to makeit.A.Even though B.If so C.Anyhow D.Instead