题目内容

19．The bellindicating（indicate） the end of the period rang，interrupting our heated discussion．

分析 表明这一节课结束的铃声响了，打断了我们热烈的讨论．

解答 答案是indicating．本题考查现在分词做定语；名词the bell后面的indicate the end of the period充当的是定语，故用非谓语动词的适当形式；动词不定式做定语常常表示"将来"；现在分词做定语表示与被修饰的名词之间是"主动、进行"的关系；过去分词做定语表示分词与被修饰的名词之间是"被动或完成"的关系；本题中indicate与the bell之间是主动关系，故用Indicating．

点评 本题是要求用所给动词的适当形式填空，解题时首先考虑句中需要的是谓语动词还是非谓语动词；其次，如果是谓语动词关注时态、语态和数的变化；如果是非谓语动词要联系非谓语的基本用法判断非谓语的形式．

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