题目内容

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

解析:

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

When Madam Curie did the science experiment again, she was more careful where she_____ a mistake.

A. made B. has made C. was making D. had made

When Madam Curie did the science experiment again，she was more careful she had made a mistake．

A．when B．how C．what D．where

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