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单选

According to Mr. Gustafson, some efforts to introduce other nutritious crops to Africa failed because ____ .

  • A.people don’t like them
  • B.people cannot afford them
  • C.they don’t taste delicious
  • D.they have strange colors
试题出自试卷《2012年10月全国自主考试综合英语(一)真题及答案》
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