. I first met Mr Zhao nine years ago. He ____ at a chemical college at that time.A.had workedB.has w

题目简介

. I first met Mr Zhao nine years ago. He ____ at a chemical college at that time.A.had workedB.has w

题目详情


. I first met Mr Zhao nine years ago. He ____ at a chemical college at that time.
A.had workedB.has workedC.was workingD.had been working
题型:单选题难度:偏易来源:不详

答案

C

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