1 (),it immediately ran away.
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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
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.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.
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.
1 (),it immediately ran away.
(),it immediately ran away.A.on being observed B.having been
------,it immediately ran away.B.On being observing C.Having
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