题目内容
I first met Mr Zhao nine years ago.He ________ at a chemical college at that time.
[ ]
A.had worked
B.has worked
C.was working
D.had been working
答案:C
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题目内容
I first met Mr Zhao nine years ago.He ________ at a chemical college at that time.
A.had worked
B.has worked
C.was working
D.had been working