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

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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
单项选择题
Judging from his manners at the party, he doesn't seem（）much education.

A．to receive
B．to be receiving
C．to have received
D．to have been received
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