单项选择题
The president tried to stay in touch with the ambassador ______.
A．at large
B．at hand
C．at a trot
D．at one stroke
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单项选择题
As the city has become increasingly ______ and polluted, there has been a growing realization that certain action urgently needed.
A．flourished
B．boosted
C．congested
D．mingled
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