题目

Walking down the street the other day, _____. 　　A. I saw unusual something happened　　B. a terrible accident happened 　　C. something unusual was seen by me　　D. I saw a terrible accident 答案：D 解析:  现在分词是主语的动作，因此I做句子的主语；修饰不定代词时，形容词要后置。

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