新概念3时态 experts confirmed that a puma will not attack a human

英语的虚拟语态新概念第三册第一课就有一个句型:a puma will not attack a human being experts were convinced that the animal was a puma.experts we Pumas never attack a human being except_____conered. A.that Were the experts sure that the animal was a puma?Why? Pumas never attack a human being except( )cornered?这新概念的老问题哈 关于UnlessUnless表示if not.在新概念三第一课里有一句...,and experts confirmed only when it is hungry will a lion attack a human being. 关于新概念英语第三册 “a puma at large"的一个时态问题 新概念3第一课puma at a large 新概念英语3第一课“A puma at large” pumas never attack a human being expect _____cornered.A.they Pumas never attack a human being except( )cornered?