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这几道题应该选什么,为什么,

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这几道题应该选什么,为什么,
1.-It is rather cold here.Shall we light a fire?
-No,we ___ because things are easy to catch fire.
A.won't B.can't C.mustn't D.needn't
2.It has been announced that candidates ___ remain in their seats until all the papers have been collected.
A.can B.will C.may D.shall
3.-Must I bring my lunch here?
-No,you___.We have prepared it.
A.don't have to B.shouldn't C.mustn't D.needn't
4.-Mum,I've been studying English since 8o'clock.___I go out and play with Tom for a while?
-No,I'm afraid not.Besides,it's raining outside.
A.Can't B.Wouldn't C.May not D.Won't
我都不太明白,
同意czs0_00
1 这个是原高三英语最后一课上的原句,shall we.,的否定回答是we can't.
2 从语意上选择的,所有的候选人都必须.,而必须就只能选shall了
3 Must 开头的疑问句否定回答是needn't
4 如果有may ,那么我觉得这个也可以,但是may not就不行,具体意思现在不记得了,你查下词典,我就不能出去和TOM玩会吗?不能,所以选择can't