单选题 (Walking) in the street, the ears and buses (are running) (like) (streams).

【正确答案】 A

【答案解析】[解析] 应当改为if you walk。原因是在于分词主语和句子的主语不一致。这个句子还可以改写成“Walking in the street，you will see that the cars and buses are running like streams.”。