________on a clear day,far from the city
问题:
________on a clear day,far from the city crowds,the mountains give him a sense of peace.
A.Walked
B.To walk
C.Having walked
D.When he is walking
________on a clear day,far from the city crowds,the mountains give him a sense of peace.
A.Walked
B.To walk
C.Having walked
D.When he is walking