单项选择题
A．down
B．up
C．about
D．out
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单项选择题
A．pollutionB．trialC．serviceD．charge
A．pollution
B．trial
C．service
D．charge
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单项选择题
A．undertakingB．underliningC．understandingD．undergoing
A．undertaking
B．underlining
C．understanding
D．undergoing
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