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
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

hit it off immediately 啥意思? I'll report it immediately改同义句. 4.it is important he(be)_______ callde back immediately （）,it immediately ran away.A.on being observed B.having been observed这个为什么选A 我觉得B比较对.新概念第三册的第一篇 ,it immediately ran way.(新概念英语选择题）A：Observing her B:On being observed C:Having been observed D:On her being observed 1、It is advisable that he _______________ (be) sent there immediately.2、London _________________用括号里单词的正确形式填空 We can't do it for you.(同义句转换）We _____ _____ _____ do it for you.I'm leaving for Rome immediately.I'm leaving for Rome __ ____. 首字母填词：1）These gifts must be mailed immediately so as to be r___ in time for Christmas.2）We heard with r____ that you were not successful in your plan.3)Don't worry about it ,just try to r____. 立刻的英文（三种）我只知道immediately 英语首字母完形填空The Cannes Film Festival is the most famous film festival in the world.（I 1 ） a film is presented (上演) there it is immediately famous.The festival is also where some of the film industry’s most important business 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 immediately是什么意思 I think it may be I couldn’t immediately associate my knowledge with practice. he immediately accused the man of not declaring it翻译这句话, We must have the pipe fixed immediately.It ____(leak)for a whole week. 翻译Don't beat a retreat immediately after you should make another attempt to hit it. As soon as I came to the old town,I liked it immediately 的同义句 You need to do it immediately,( )I changed my mind.A、beforeB、afterC、whenD、until