问题
选择题
______ on a clear day, far from the city crowds, the mountains gave him a sense of peace.[ ]
A. If walking
B While walking
C. Walking
D. When he was walking
答案
答案：D
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______ on a clear day, far from the city crowds, the mountains gave him a sense of peace.[ ]
A. If walking
B While walking
C. Walking
D. When he was walking
答案：D