单项选择题

Facts do not cease () because they are ignored.

A．their existence
B．existing
C．in existence
D．to exist

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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
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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