单项选择题

He recently （） a new habit of drinking tea at midnight.

A．developing
B．developed
C．develop
D．development

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单项选择题

About 10 years ago, you could hardly get （） information about the PC.

A．no
B．any
C．some
D．certain

单项选择题

The professor of history is studying some major historical （） .

A．incidents
B．accidents
C．events
D．elements

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