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 |
推荐套卷
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 |