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 be to do表示已经计划好，马上要做的事情，完成时表示业已完成的动作。因为动作发生在过去(a month ago)，这里用was to have done表示从过去某时看将来某时业已完成的动作，故选项B正确。

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Lindawas_____theexperimentamonthago,butshechangedhermindatthelast