I was out of town at the time, so I do not know exactly how it ______.

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问题 I was out of town at the time, so I do not know exactly how it ______.

选项 A、was happening
B、happened
C、happens
D、has happened

答案B

解析本题考查的是句子时态。句意为：当时我不在城里，所以不知道事情是怎样发生的。根据语境可知，事情发生在过去，所以要用一般过去时。故选B。

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