单项选择题

I took the medicine 10 minutes ago, but the bitterness is still ______ in my mouth.

A．scattering
B．feeling
C．maintaining
D．lingering
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单项选择题
The newly built factory is in urgent need of a number of skilled and ______ workers.
A．consistent
B．conscious
C．confidential
D．conscientious
单项选择题
As an outstanding scholar, he has become ______ to the research team.
A．senior
B．junior
C．indispensable
D．independent
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