Are you still teaching in that school? No, I’m not. It’s two

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Are you still teaching in that school? No, I’m not. It’s two years _______ I worked there.
A. after B. before C. until D. since
which one is right?

D
it's + 时间段+since + .过去式
表示自从过去干某事以来.以来有多长时间了
你还在学校教书么?不了,我已经两年不教了.
再问： it's + 时间段+since + 。。。过去式表示自从过去干某事以来。。。以来有多长时间了----------这个句型表达的不是从那时以来就一直做那个动作吗?这样与No, I am not.不符噢.
再答： It is + 段时间 + since... / It has been + 段时间 + since...表示“从……起已有多长时间了”。两句型意思相同，前者是规范说法，后者是口语说法。用法：since从句中常用一般过去时，若从句中是持续性动词的一般过去时，则表示该动作结束有多长时间了。如： It is three years since he smoked. 他不吸烟已有3年了。试比较： It is three years since he began to smoke. It is three years since he has smoked. 两句均意为：他吸烟已有3年了。你原句如果是 since I began to work here 就是一直在教的意思了

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