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

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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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专业英语四级

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