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

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 关于新概念英语第三册 “a puma at large"的一个时态问题 Pumas never attack a human being except( )cornered?这新概念的老问题哈 《新概念英语》（第三册）第一课《A Puma at Large》 新概念英语第三册第一课 A puma at large课后习题：structure结构5、People said____ only when it is hungry will a lion attack a human being. 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_____conered. A.that Pumas never attack a human being except( )cornered? pumas never attack a human being except ___cornered. 新概念三的英语问题!新概念三第一课中：A wild puma had been spotted forty-five m