Before____of synthetic(合成的) dyes(染料), yarns were often colored by

发布时间:2021-04-12 03:49:48

  Before____of synthetic(合成的) dyes(染料), yarns were often colored by dyes obtained from natural vegetable and
  mineral matter.
  (A) introducing
  (B) introduction
  (C) the introduction
  (D) introducing that

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答案:C
  测试点:名词/冠词。分析:of 前应为名词,而名词前应有冠词,故选(C).
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