单项选择题
A．productive
B．efficient
C．affluent
D．proficient
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单项选择题
A．properB．promptC．prominentD．profound
A．proper
B．prompt
C．prominent
D．profound
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单项选择题
A．on the contraryB．in the meantimeC．howeverD．on the other hand
A．on the contrary
B．in the meantime
C．however
D．on the other hand
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