单选题
I first met Mary three years ago when we ______ in a middle school together.
A、
have worked
B、
had been working
C、
were working
D、
had worked
【正确答案】
C
【答案解析】
[解析]本题是考查有关动词时态的用法。根据本句句意：我第一次遇见玛丽是在3年前当我们一起在中学工作的时候。从时间状语从句来看，显然用过去进行时。故本题答案为C。
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