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I was out of town at the time, so I don’t know exactly how it . A. was happening

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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    

试题答案

B 
解析: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.