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Iboughtthecoatfor70dollarslastweek.It'sonsalefor45.oh,really?butHow-----Iknowdid还是would还是will还是do?为什么?

题目详情
I bought the coat for 70 dollars last week.
It's on sale for 45.
oh,really?but How -----I know
did还是 would还是 will 还是do?
为什么?
▼优质解答
答案和解析
用would.
-我上周花70元买了件衣服.
-现在打折,45元.
-真的?可我当时怎么能知道.
可见这人是在说,他在买的时候无法知道以后它会打折.