单项选择题

() on a clear day far from the city crowds, the mountains give him a sense of peace.

A．If walking
B．While walking
C．Walking
D．When one is walking

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单项选择题
A teacher cannot take it for granted that his students always do their homework ().

A．as follows
B．as required
C．as they have
D．as they do
单项选择题
I have enjoyed my visit here. I'll be very sorry ().

A．for leaving
B．to leave
C．of leaving
D．with leaving
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