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【单选题】
在以下哪种情况,“搭便车”问题会出现( )。A.
所有消费公共商品的个人都支付其费用
B.
个人愿意支付他们的消费费用
C.
所有消费和生产的商品都是私人物品
D.
有些人消耗了公共物品，并不需要支付其全部费用
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反馈参考答案：
举一反三
【单选题】He said that the passenger _______ an accident; otherwise he would have arrived by that time
A.
must have
B.
must have had
C.
would have had
D.
should have had
【简答题】柴油机的机座功用之一是承受曲轴回转时的扭转应力
【单选题】If we ________ one of the other uploading approaches, the process would have taken longer than one hour.
A.
used
B.
had used
C.
should use
D.
would use
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