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


解析:

由句意知“犯錯誤”是發(fā)生在“was more careful”之前，故用過去完成時。

【標簽】動詞時態(tài)

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