单项选择题

Teachers told us ______ here; it's dangerous.

A．to swim
B．not to swim
C．to not swim
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单项选择题
It's a funny ______ to make a pen with a machine in it.
A．idea
B．trouble
C．story
单项选择题
The smile on his face shows that he is ______ his students' work.
A．worded about
B．pleased with
C．sorry for
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