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
We should always bear in mind that ______ decisions often result in serious consequences.
A．urgent
B．instant
C．prompt
D．hasty
单项选择题
He's ______ as a bellyacher -- he's always complaining about something.
A．who is known
B．whom is known
C．what is known
D．which is known
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