2. 外语
  3. Linda was _____ the experiment a month ago, but she changed her mind at the last minute.

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 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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