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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