题目内容
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
B
解析:
略
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题目内容
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
B
略