题目内容
15. When Madam Curie did the experiment again, she was more careful where she _____ a mistake.
A. made B. has made C. was making D. had made
D
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题目内容
15. When Madam Curie did the experiment again, she was more careful where she _____ a mistake.
A. made B. has made C. was making D. had made
D