单项选择题

He had always kept a ___________ eye on what was happening around him.

A．clear
B．keen
C．distinct
D．sensitive
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单项选择题
I think it ___________ high time they ___________ to take you more seriously.
A．was, began
B．is, should begin
C．should be, begin
D．is, began
单项选择题
Those joint ventures in China enjoy certain ___________ that other enterprises do not.
A．advantages
B．privileges
C．priorities
D．rights
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