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.你還在吸煙嗎?
--不,沒有.我已經(jīng)戒煙三年了.

解答 答案:A.
根據(jù)后面的句子It's three years since I smoked可知Tom已經(jīng)三年不吸煙了,It is+段時間+since…表示"從…起已有多長時間了",如果該從句的謂語動詞是延續(xù)性動詞作,從句必須作否定翻譯.另如:It is three years since he worked there.自從他不在那兒工作以來,已經(jīng)三年了.故選A.

點評 It is+段時間+since…表示"從…起已有多長時間了".
用法:since從句中常用一般過去時,若從句中是持續(xù)性動詞的一般過去時,則表示該動作結(jié)束有多長時間了.如:It is three years since he smoked.他不吸煙已有3年了.
試比較:
It is three years since he began to smoke.
It is three years since he has smoked.兩句均意為:他吸煙已有3年了.

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