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有关GDP的英语选择题

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有关GDP的英语选择题
If Susan switches from going to speedy lube for an oil change to changing the oil in her car herself,then GDP
A.necessarily rises
B.necessarily falls
C.will be unaffected because the same service is produced in either case.
D.will be unaffected because car maintenance is not included in GDP.
有关GDP的英语选择题
B