It's 3 years since I saw him last time.中的it's 能否换成has been?

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• It's 3 years since I saw him last time.中的it's 能否换成has been?
• It's 3 years since I saw him last time. 中的is能否换成has been? 请说明原因好吗.
• It's 3 years since I saw him last time.能不能换成it was...
• It's 3 years since I saw him last time.能不能换成it was...
• It's 3 years since I saw him last time. 中的is能否换成has been? 请说明原因好吗.
• after since when 用法it's three years ___i saw him last time.应选哪个?为什么?谢大侠了!如果用SINCE是不是主句应该用完成时态呢？如IT HAS BEEN THREE YEARS SINCE I SAW HIM LAST TIME。再谢过各位大侠！It seemed only severval minutes___ he finished this painting.a.after b.before c.when d.until如大侠 cglzhxy所说，这一题是不是该选A呢？
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• It's 3 years since I saw him last time.中的it's 能否换成has been?
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