单项选择题
A.on
B.in
C.at
D.to
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单项选择题
A.spendingB.demandingC.consumingD.saving
A.spending
B.demanding
C.consuming
D.saving
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单项选择题
A.orB.andC.butD.while
A.or
B.and
C.but
D.while
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