单项选择题

These modern computers are used all ___________ the world.

A．on
B．in
C．over
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单项选择题
He was first ___________ the finishing line. He was the winner.
A．across
B．past
C．through
单项选择题
My father bought me ___________. Which of the following is wrong
A．three dozen pens
B．several dozens of pens
C．four dozens pens
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