单项选择题
边际社会成本等于边际社会收益时,达到什么状态。()
A.利润最大
B.产出最大
C.个人选择最优
D.帕累托最优
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单项选择题
i __________to like swimming very much when i was a boy.
A.was
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单项选择题
i always avoid _________________ to supermarkets on saturday and sundays-- they are often too busy.
A.gone
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