Mr. Keller forty cigarettes a day until he gave it up. A. had smokedB. smokes C. have sm

问题补充：

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

A. had smoked

B. smokes

C. have smoked

D. smoked

答案：

A. had smoked

B. smokes

C. have smoked

(答案→)D. smoked

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