单选题：I first met Mary three years ago when we_________in a middle

题目内容：

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

参考答案：

答案解析：

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有以下程序： #include #includestruct A{int a；char b[10]；double

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