Kate was______the experiment a month ago, but she changed her mind at the last minute.

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问题 Kate was______the experiment a month ago, but she changed her mind at the last minute.

选项 A、to start
B、to have started
C、to be starting
D、to have been starting

答案B

解析句意：凯特本应一个月前就开始实验，但她在最后一刻改变了想法。be to do是固定用法。由于start the experiment这个动作先于change her mind，所以用过去完成时be tohave done表示在过去的事情对现在的影响。

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