单项选择题
A.for
B.at
C.on
D.about
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单项选择题
A.keepB.retainC.maintainD.reserve
A.keep
B.retain
C.maintain
D.reserve
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单项选择题
A.exposedB.vagueC.uncoveredD.hidden
A.exposed
B.vague
C.uncovered
D.hidden
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