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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单项选择题
His employer has（）his wages.

A．lifted
B．raised
C．rose
D．increased
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
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