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
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目
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