单项选择题
A.existing
B.new
C.old
D.future
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单项选择题
A.efficientB.effectiveC.availableD.economical
A.efficient
B.effective
C.available
D.economical
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单项选择题
A.onB.inC.forD.from
A.on
B.in
C.for
D.from
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