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12.-Hi,Tom.Do you still smoke?
-_______.It's three years since I smoked.(  )
A.No,I don'tB.Yes,I do
C.Not too muchD.Oh,yes,but I wish I didn't

分析 --你好,Tom.你还在吸烟吗?
--不,没有.我已经戒烟三年了.

解答 答案:A.
根据后面的句子It's three years since I smoked可知Tom已经三年不吸烟了,It is+段时间+since…表示"从…起已有多长时间了",如果该从句的谓语动词是延续性动词作,从句必须作否定翻译.另如:It is three years since he worked there.自从他不在那儿工作以来,已经三年了.故选A.

点评 It is+段时间+since…表示"从…起已有多长时间了".
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.

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