— Do you smoke?

— No, I don’t. But I used to. It’s 20 years since I ______.

A. didn’t smoke B. have smoked C. smoked D. began to smoke

 

C

【解析】

試題分析: 句意：--你吸煙嗎？--不，我不吸煙。但是我過去吸煙。我有二十年不吸煙了。Since 引導(dǎo)的從句應(yīng)該用一般過去時態(tài)，排除B。而since引導(dǎo)的時間狀語從句中的動詞如果是延續(xù)性動詞，表示從這個動作結(jié)束時，譯為“自從不…”；如果是短暫性動詞，表示從這個動作開始，譯為”自從….”.本句中smoke是延續(xù)性動詞，而且從前面內(nèi)容可知說話人已經(jīng)不再吸煙，故選C。

考點(diǎn)：考查狀語從句

 

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