----- How did you know the surprising news?
----- I happened _______ the event then.
A．to coverB．to be coveringC．coveringD．to have covered
B

試題分析：考查不定式用法。固定詞組happen to do sth碰巧做某事；如果后面的動作是已經(jīng)發(fā)生的，就使用不定式的完成式；如果動作是與謂語動詞同時發(fā)生的，就用不定式的進行式。句意：—你是怎么知道這個出人意料的消息的？—那個時候我碰巧正在采訪那個事情。故B正確。
點評：如果不定式表示的動作是和謂語動詞同時發(fā)生的使用不定式的進行式；如果是稍后發(fā)生的，使用一般式；如果發(fā)生在謂語動作之前，就使用完成式。
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