单项选择题

The fact that the management is trying to reach agreement ______ five separate unions has led to long negotiations.

A．over
B．upon
C．in
D．with
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单项选择题
______ , he always tries his best to complete it on time.
A．However the task is hard
B．However hard the task is
C．Though hard the task is
D．Though hard is the task
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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