单选题 (While walking) on a sunny day, (far from) the city crowds, the mountains give him (a sense of) (infinite) peace.
A. While walking B. far from C. a sense of D. infinite

【正确答案】 A

【答案解析】主语the mountains与动词walk之间没有主被动关系，需要在walk前加独立主语构成独立主格结构。如可以改为While Tom walking。