had been cloning
- past perfect progressive of clone.
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
