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题目内容
Before scientists learned how to make a synthetic growth hormone, removing it painstakingly in small amounts from the pituitary glands of human cadavers.
  • Ascientists learned how to make a synthetic growth hormone, removing it painstakingly 分析该选项
  • Bscientists had learned about making a synthetic growth hormone, they had to remove it painstakingly 分析该选项
  • Cscientists learned how to synthesize the growth hormone, it had to be painstakingly removed 分析该选项
  • Dlearning how to make a synthetic growth hormone, scientists had to remove it painstakingly 分析该选项
  • Elearning how to synthesize the growth hormone, it had to be painstakingly removed by scientists 分析该选项
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正确答案: C
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题目基本信息

  • 所属科目:语法SC
  • 题目来源1:PREP07 Test 2-21
  • 正确率: 38%
  • 难度:

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