单选题Walking down the street&n

问题补充：

单选题Walkingdownthestreettheotherday,_____.A.I saw unusual something happenedB.a terrible accident happenedC.something unusual was seen by meD.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。