1.The history professors were dealing wih these in historica

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1.The history professors were dealing wih these in historical _____?
A.sequence B.sccession C.series.D.success
2.It is essential that he _____ extracurricular activities.
A.will participate B.participates C.participate D.shall participate
3.He talked as if he ______ the incident.
A.had witnessed B.witnessed C.witness D.have witnessed
4.Frankly speaking,I'd rather you _____anything about it for the time being.
A didn't do B.haven't done C.don't do D.have done
这几题是我做错的,希望能给我讲解一下,

1 A in sequence 固定搭配,按顺序,当中可以加形容词解释按.顺序
2 C it be essential that +原型虚拟
3 A 主句过去不虚拟,从句与过去事实相反的虚拟had done
4 A would rather sb did sth 与现在时间相反的虚拟用过去式

She recognized the absurdity of dealing with these people th Most ot the professors ____ to the conference were from Beij 英语翻译These researchers were instrumental in laying the founda 英语翻译In the history most of the greatest inventions were done "Study history,study history.In history lies all the secrets They were ___________(welcome) by the history. 英语翻译In the United States,holding your hand up wih the thumb Were all these people in the bus injured in the accident?-No these apples were in the bag (对in the bag 提问) 英语翻译The important thing lies in dealing whith trivial thing make a interview wih your friends and fill in the form(翻译成中文 I think dealing with all these problems in a few weeks is di