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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The police let him go, because they didn’t find him guilty （）the murder.

A. of
B. in
C. over
D. on
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The fact that the management is trying to reach agreement （）five separate unions has led to long negotiations.

A. over
B. in
C. upon
D. with
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