Linda was______the experiment a month ago, but she changed her mind at the last

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问题 Linda 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

解析动词时态题。这里考查过去将来完成时的用法，be to do是表示已经计划好，马上要做的事情，因为动作发生在过去(a month ago)，这里用was to have done，表示过去的事情对现在的影响。

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