1 （）,it immediately ran away.
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
英語人氣：441 ℃時(shí)間：2020-01-28 18:41:46
優(yōu)質(zhì)解答
1.B On ...和 when ...,意思都一樣,“當(dāng)……的時(shí)候”.On being observed也可以寫作On the time when it is being observed 句意：一被人看到,美洲獅就跑掉了.2.D 情態(tài)動(dòng)詞表達(dá)推測(cè)的語意概念時(shí),對(duì)于過去事實(shí)推測(cè)一定...
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