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
By the year 2000, production in the area is to double ______ of 1990.
A．that
B．it
C．one
D．what
单项选择题
John was young, ______, he was equal to this important task.
A．therefore
B．moreover
C．nevertheless
D．hence
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