单项选择题
A.in
B.upon
C.at
D.on
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单项选择题
A.atB.inC.onD.with
A.at
B.in
C.on
D.with
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单项选择题
A.regulationB.climateC.circumstanceD.requirement
A.regulation
B.climate
C.circumstance
D.requirement
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