问题
选择题
. 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
答案：C
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. 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