clone
had been cloning
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past perfect progressiveof clone.past perfect progressive
Used to describe an action that was ongoing continuously in the past up until another past event interrupted it.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The company's parent group, Intrexon Corp., had been cloning thousands of livestock for more than 15 years and had recently delved into the pet-cloning business.
From US News ● Aug. 4, 2016
