is your grandpa still smoked?----no ,It's years s(since) he smoked?讲解一下为什么用sincesmoking 刚打错了

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is your grandpa still smoked?----no ,It's years s(since) he smoked?讲解一下为什么用sincesmoking 刚打错了
is your grandpa still smoked?----no ,It's years s(since) he smoked?讲解一下为什么用since
smoking 刚打错了

is your grandpa still smoked?----no ,It's years s(since) he smoked?讲解一下为什么用sincesmoking 刚打错了
since有是自从,但是意思有“自从不再做……时起”
就是说从他不吸烟起已经有一段时间了.

it's +一段时间since+从句句型中,since后跟一般过去时句子
这个句型是初中的要掌握