When Madam Cuirie did the science experiement again, she was more careful where she _____ a mistake.
A. made B. has made C. was making D. had made
When Madam Cuirie did the science experiement again, she was more careful where she _____ a mistake.
A. made B. has made C. was making D. had made
D
由句意知“犯错误”是发生在“was more careful”之前,故用过去完成时。
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