Mr. Smith works as a government official now but he in a middle school for 5 years.A. h

问题补充：

Mr. Smith works as a government official now, but he in a middle school for 5 years.

A. has worked

B. worked

C. had worked

D. had been working

答案：

A. has worked

(答案→)B. worked

C. had worked

D. had been working

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