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请问这几道英语题目请帮我指出选择题答案的原因(道理),1.The man you want to see has arr

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请问这几道英语题目
请帮我指出选择题答案的原因(道理),
1.The man you want to see has arrived.______he come at once?
填 Shall
2.Come what ____,we are not going to make any concessions to his unreasonable demands.
填 may .
3.We ought to go there by air,_____?
填 shouldn't we
4.On no account_____our friends.
填 must we betray .
5._____that Tom did it,what harm is there?
填 Granted .
以上5题希望您来为我们讲解一下,
1.shall,此处是情态动词,表邀请,征询对方的意见.
2.come what may 是固定的短语,不管发生什么.
3.前半句用ought to,后半句的反义疑问句,动词用shouldn't,是固定搭配用法.我们应该吗?
4.on no account决不,要求引起倒装.所以后面是部分倒装形式must情态动词,we主语,betray实义动词.
5.granted that 即使,假定,是固定用法.