单项选择题

We'd better () for the bell is ringing.

A．stop to talk
B．to stop to talk
C．stop talking
D．to stop talking

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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
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
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