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IT has been a long time since you dropped in---- 反义疑问句

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IT has been a long time since you dropped in---- 反义疑问句
为何要说 hasn't it 而不说 didn't you
反意疑问句在做时要清楚,最后反问的是什么问题.
It has been a long time 是主句,since you dropped in是从句.
反义疑问句要根据主句来.
这里反问的是主句:难道不是(很长时间了)吗?
I don't think these are made of real silk,are they?
通过翻译来看,要反问的是:我认为这些不是用真丝制造,难道不是(没用真丝制造)吗?
所以反问要用are they?(注意这句中否定是在从句,但not要提前,因为是I think 引导)