题目内容

16．Look，so many people are running out of the station．I wonder what ________．（　　）
A．is happenedB．was happeningC．is happeningD．had happened

分析 看，这么多的人正从火车站跑出来，我想知道正在发生什么事．

解答 答案：C 根据对于关键句的理解Look，so many people are running out of the station．（看，这么多的人正从火车站跑出来）可知，后面的这句话应是强调正在发生的事，所以应该用现在进行时，其结构为be+动词的现在分词．发生的事应为单数概念，所以应该用系动词的单数形式is，再加happen的现在分词happening．故选C．

点评 此题考查现在进行时的用法．做题时一定要抓住句子的关键词并联系前后句的语境去理解整个句子，从而确定用何种时态．尤其是现在进行时，be动词和现在分词缺一不可，不要漏掉任何一个．另外要注意其变化形式，避免出错．

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