1 (),it immediately ran away.a.Observing her b.On being oberved c.Having been oberved d.On her being oberverd2 The experts were now fully convinced that the animal ( ) a puma.a.must be b.should have been c.can only be d.could only have been
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![1 (),it immediately ran away.a.Observing her b.On being oberved c.Having been oberved d.On her being oberverd2 The experts were now fully convinced that the animal ( ) a puma.a.must be b.should have been c.can only be d.could only have been](/uploads/image/z/4788993-57-3.jpg?t=1+%EF%BC%88%EF%BC%89%2Cit+immediately+ran+away.a.Observing+her+b.On+being+oberved+c.Having+been+oberved+d.On+her+being+oberverd2+The+experts+were+now+fully+convinced+that+the+animal+%28+%29+a+puma.a.must+be+b.should+have+been+c.can+only+be+d.could+only+have+been)
1 (),it immediately ran away.a.Observing her b.On being oberved c.Having been oberved d.On her being oberverd2 The experts were now fully convinced that the animal ( ) a puma.a.must be b.should have been c.can only be d.could only have been
1 (),it immediately ran away.
a.Observing her b.On being oberved c.Having been oberved d.On her being oberverd
2 The experts were now fully convinced that the animal ( ) a puma.
a.must be b.should have been c.can only be d.could only have been
1 (),it immediately ran away.a.Observing her b.On being oberved c.Having been oberved d.On her being oberverd2 The experts were now fully convinced that the animal ( ) a puma.a.must be b.should have been c.can only be d.could only have been
1.B On ...和 when ...,意思都一样,“当……的时候”.On being observed也可以写作On the time when it is being observed 句意:一被人看到,美洲狮就跑掉了.
2.D 情态动词表达推测的语意概念时,对于过去事实推测一定要用于情态动词have以及过去分词形式进行搭配.A 项 must be 是对客观现实的一种推测,应该跟主句的谓语动词“were now fully convinced ”保持一致,C项的can 与前面 的时态不一致,需改为could;B项should have been 表示本该是,而实际上不是的意思.因此答案为D.
每一个选D,
第二个选A.
1.D On being observed ,一被人看到 on 是介词“一……就……”
“一被看到,它立即就逃跑了”
2.A must 表示非常肯定的推测 “一定是”
“专家们现在充分确信那只动物一定是美洲豹”
1 D2.A
1.b ,一…就 2 a,从concince可看出专家很确定,所以选第一个
1 b 2 a
c和a
第一题选D,on one’s being done表示一。。。就。。。
第二题选A,这里的must表猜测