题目内容

---- 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：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。
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