【单选题】【消耗次数：1】
1. I help him ____ he helps me. We help each other.
①
but
②
and
③
or
④
though
参考答案：
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随机题目
【单选题】
机会成本是指（）。
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在选择一个行动方案时，因放弃了另一个最佳替代方案而做出的牺牲。
②
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③
在选择一个行动方案时，被放弃的另一个方案的成本。
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从销售收入中扣除正常利润之后得出的成本。