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

解析因为是过去的过去，所以应该用过去完成时，故选B。

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专业英语四级

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