I was out of town at the time, so I don’t know exactly how it _______. 
A．was happeningB．happened C．happensD．has happened
B　
本題考查具體語(yǔ)境中的時(shí)態(tài)，后一句隱藏的時(shí)間狀語(yǔ)是at the time.
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