I was out of town at that time, so I don’t know exactly how it ______.
A．was happeningB．happened
C．has happenedD．happens
B

試題分析：考查時(shí)態(tài)。句意：在那時(shí)我在城外。使用我不知道那件事情是如何發(fā)生的。根據(jù)關(guān)鍵詞at that time，這是一個(gè)很清楚的過(guò)去時(shí)的時(shí)間狀語(yǔ)，可知指在過(guò)去某個(gè)時(shí)間發(fā)生的事情，故使用一般過(guò)去時(shí)，故B正確。
點(diǎn)評(píng)：試題的考查要放在上下文語(yǔ)境中進(jìn)行。本題的事情是在過(guò)去發(fā)生的，故使用過(guò)去時(shí)。
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