单项选择题

I don't think it is any use（）this matter any further

A．discussing
B．to discuss
C．to discussing
D．to be discussed

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单项选择题
By the sixth century AD, when few Europeans could read, the Chinese（）paper.

A．invented
B．had invented
C．have invented
D．had been invented
单项选择题
We kept our（）all night to frighten the wolves.

A．burning fire
B．burnt fire
C．fire burning
D．fire burnt
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