how many years has it been since we last saw each other?

how many years has it been since we last saw each other?

题目
how many years has it been since we last saw each other?
这里的 has it been 这个该怎样翻译啊 ..能解释更好了....
答案
has it been=it has been
已经过了(多久了)
It has been many years since we last saw each other.
上次见面到现在已经好多年了
换成疑问句,颠倒主谓就成了
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