单项选择题

As a developing country, we must keep_______with the rapid development of the world economy.

A．move
B．step
C．speed
D．pace
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单项选择题
The two speakers are probably_______.
A．in a parking ground.
B．at a ferry-crossing.
C．in a traffic jam.
D．at a petrol station.
单项选择题
I’’m sure your suggestion will ______ the problem.
A．contribute to solving
B．be contributed to solving
C．contribute to solve
D．be contributed to solving
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