【題目】—Hi, Tom, would you like to smoke?

—No, thank you. It has been six months since I _________ smoking.

A. stop B. stopped C. am stopping D. will stop

【答案】B

【解析】句意:——嗨,湯姆,你想抽煙嗎?——不,謝謝。我戒煙已經(jīng)六個(gè)月了?疾閯(dòng)詞時(shí)態(tài)辨析題。since自從,用于現(xiàn)在完成時(shí),引導(dǎo)的時(shí)間狀語(yǔ)從句需用一般過(guò)去時(shí),根據(jù)句意語(yǔ)境,可知選B。

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