单项选择题
A.traces back
B.results in
C.tracks down
D.stems from
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单项选择题
A.activeB.ignoredC.inactiveD.useless
A.active
B.ignored
C.inactive
D.useless
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单项选择题
A.onB.forC.upD.until
A.on
B.for
C.up
D.until
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