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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

试题分析:考查不定式用法。固定词组happen to do sth碰巧做某事;如果后面的动作是已经发生的,就使用不定式的完成式;如果动作是与谓语动词同时发生的,就用不定式的进行式。句意:—你是怎么知道这个出人意料的消息的?—那个时候我碰巧正在采访那个事情。故B正确。
点评:如果不定式表示的动作是和谓语动词同时发生的使用不定式的进行式;如果是稍后发生的,使用一般式;如果发生在谓语动作之前,就使用完成式。
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