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Mr. Keller forty cigarettes a day until he gave it up. A. had smoked B. smokes C

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Mr. Keller forty cigarettes a day until he gave it up. A. had smoked B. smokes C

Mr. Keller _________ forty cigarettes a day until he gave it up.

     A. had smoked           B. smokes                    C. have smoked            D. smoked

试题答案

D

解析: