When Madam Cuirie did the science experiement again, she was more careful where she _____ a mistake.


  1. A.
    made
  2. B.
    has made
  3. C.
    was making
  4. D.
    had made
D
由句意知“犯錯(cuò)誤”是發(fā)生在“was more careful”之前，故用過去完成時(shí)。
【標(biāo)簽】動(dòng)詞時(shí)態(tài)
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When Madam Cuirie did the science experiement again, she was more careful where she _____ a mistake.

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