单选题:The country exports crude oil and imports refined petroleum

  • 题目分类:英语四级
  • 题目类型:单选题
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题目内容:
The country exports crude oil and imports refined petroleum products because________ A.it does not have functioning refineries
B.it is an oil-producing nation
C.there is a sharp increase in transport costs
D.it is a good way to earn money

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