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I was out of town at the time，so I don’t know exactly how it ________.

A．was happening B．happened
C．happens D．has happened

B

解析由前半句可知“事情”發(fā)生在過(guò)去，而不強(qiáng)調(diào)對(duì)現(xiàn)在的影響，故用一般過(guò)去時(shí)。

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