单项选择题
A．However
B．And
C．Therefore
D．So
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单项选择题
A．offeringB．offeredC．which offeredD．to be offered
A．offering
B．offered
C．which offered
D．to be offered
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单项选择题
A．efficiencyB．energyC．timeD．money
A．efficiency
B．energy
C．time
D．money
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