I was out of town at the time, so I don’t know exactly how i
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你好,我认为这道题可以这样解释:这个句子可以改写成:When it happened, I was out of town. But I don't know exactly how it did(= happened). 在这里,HAPPEN是瞬间动词,不必用进行时.又如,When the accident happened,John was swimming in the pool. / While John was swimming in the pool, the accident happened. 明白了吗?

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