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高中英语单选!求解释!

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高中英语单选!求解释!
1._____he had many classmates during the school years,he has almost no friends now.
A.While B.When C.If D.Unless

2.He has become_____to living without electricity.There was no power while he was young in the countryside.
A.content B.accustomed C.independent D.optimistic

3.This is the first group photo _____of these baby pandas in Chengdu.
A.to take B.taking C.being taken D.taken

4.---Any information about your son?
----No,if only I____those tough words to him.
A.hadn't said B.didn't say C.shouldn't have said D.couldn't have said

5.After studying in US for many years,Mary's brother____his job as a doctor.
A.set out B.took over C.took up D.set up
A,只有它可以表示转折,然而的意思
B,习惯的意思,由于小时候农村没有电力,所以现在没电他也习惯.
D,用过去分词表示被动语态
C,表示本不应该,这里用了虚拟语气,意思是说我本不该那样说的
A,开始的意思,表示开始作为医生.