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关于语法填空,第8那为什么不用have to do 而用did?

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关于语法填空,第8那为什么不用have to do 而用did?
Sally:Hello,Mike.What are you doing inthis part of London?
Mike:Well,in fact,I am looking for aflat round here.
Sally:A flat?Do you want to move?
Mike:Yes,actually,believe it or not,Mandy and I are getting married.
Sally:It's great!Congratulates.When didyou decide that?
Mike:Only last week.It was when we werestaying with her family in Scotland.Now we're trying
to find a suitable flat.
Sally:It will be great to have you asneighbours.I hope you manage to buy one soon.
Mike:Oh,we aren't looking for one to buy.We don'thave enough money yet.We want to rent one.
Sally:Yes,of course.That's what we 8 (do) at first.Later my brother lent us some money.That's how we managed to buy ours.这里为什么不用have to do?而用did?
Mike:Really?Perhaps I'll talk to my family about it.Now,what about a coffee?There's a good place just round the corner.
Sally:What a good idea!
或者用had to do 行不行?是不是非要用did?
后面的at first 以及后面的later都证明这个行为是过去发生的,应该有过去式,所以用did
再问: 那么用had to do呢,含有不得不那样的意思?是不是非要用did?谢谢!
再答: 必须用did 因为at first的意思是起先,这句话就是起先我们那样做了。如果用你说的这个had to do的话就是,起先我们不得不那样做?前后意思就不通顺了。