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
So little () about mathematics that the lecture was complete beyond me.

A.I know
B.do I know
C.I knew
D.did I know
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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