When Madam Cuirie did the science experiement again, she was more careful where
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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
试题答案
D
由句意知“犯错误”是发生在“was more careful”之前，故用过去完成时。【标签】动词时态