It is ten years since he smoked or didn't smoke该题意思是不吸烟了以有十年可我不会解释

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It is ten years since he smoked or didn't smoke该题意思是不吸烟了以有十年可我不会解释
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It is ten years since he smoked or didn't smoke该题意思是不吸烟了以有十年可我不会解释
It is ten years since he smoked or didn't smoke
该题意思是不吸烟了以有十年可我不会解释

It is ten years since he smoked or didn't smoke该题意思是不吸烟了以有十年可我不会解释
It is ten years since he smoked 自从他吸烟已10年了.

It is ten years since he smoked
他已经抽烟有10年了
如果加上or didn't smoke
语法就有错误了
反正就是有问题

It is ten years since he didn't smoke
他不抽烟已经有10年了
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对于楼上,完成式的说法——我不同意!
虽然这里用了since,
但是不需要用完成式!

一般这种情况用现在完成时表示.
It has been ten years since he didn't smoke.
因为since是完成时专用的,自从他不吸烟这个时间点开始算,至今已经十年了.