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    16. I was out of town at the time, so I don’t know exactly how it . A. was happening B. happened C. happens D. has happened [解析]B本题考查具体语境中的时态.后一句隐藏的时间状语是at the time. [专题突破]动词时态和语态做题技巧如下: 【查看更多】

     

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