had been testing
- past perfect progressive of test.
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.
Charlie Henry from Gallos Brook Community Group said they had been testing the waterways "to prove that there are high levels in many waterways surrounding the base".
From BBC ● Jun. 23, 2026
Meta had been testing the business agent in some countries in a limited capacity before Wednesday’s launch and said it already has one million businesses using it.
From The Wall Street Journal ● Jun. 3, 2026
He had been testing a photocatalyst when he removed it during a control experiment and discovered that the reaction worked just as well and sometimes even better without it.
From Science Daily ● Mar. 14, 2026
In the weeks leading up to the fires, Heinrich said, he had been testing a suite of new features for the app, making his house “probably the most 3D-scanned home on Earth.”
From Slate ● Jul. 25, 2025
He had been testing his and Geisbert’s blood all along, and he wondered if the virus would suddenly show up in it.
From "The Hot Zone" by Richard Preston
