单项选择题
A.on
B.by
C.at
D.against
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单项选择题
A.fixedB.eternalC.permanentD.variable
A.fixed
B.eternal
C.permanent
D.variable
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单项选择题
A.liveB.catchC.putD.keep
A.live
B.catch
C.put
D.keep
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