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---- How did you know the surprising news?                
---- I happened ____ the event then.

A.to coverB.to be coveringC.coveringD.to have covered

B

解析试题分析:句意:--你怎么知道这个令人惊讶的消息的?--当时我碰巧在采访这个事件。Happen 后面一般接to do“碰巧要做”,因为当时正在采访,所以用happen to be doing碰巧正在做,选B。
考点:考查不定式的进行时

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