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Discover LudwigThe phrase "had stumbled upon" is correct and can be used in a sentence.
You can use it to describe an accidental occurrence of something. For example: "He had stumbled upon an ancient artifact that had been hidden in the sand."
Exact(56)
I had stumbled upon it.
Who knew what books Ruby had stumbled upon?
It was as if he had stumbled upon a mystery waiting to be unraveled.
Without quite knowing it, I had stumbled upon my theme – impurity.
I felt like an explorer who had stumbled upon a magical landscape.
But this day I had stumbled upon no ordinary sandwich joint.
Marcus had stumbled upon AskMe.com late in the spring of 2000.
While galloping through a forest, the prince had stumbled upon the castle of Sleeping Beauty.
Mr. LaMagna had stumbled upon a basic fact of American capitalism.
He decided to explore a place he had stumbled upon earlier in the year.
Juan Ocasio thought he had stumbled upon a good deal in the summer of 1998.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com