题目内容

I was out town at the time, so I don’t know exactly how it ____________________.
A．has happenedB．happenedC．happensD．was happening
B
考查时态。句意：那时候我出城了，因此我确实不知道它是怎么发生的。可以从句描述的是我出城使发生的动作，故用过去时态。选B。
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