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prior research has vs prior research have

prior research has vs prior research have which is much better to use in a sentence. Which is more popular in English form?

Looking on the internet deeply has found these results:

prior research has is the most popular phrase on the web.

prior research have

193,700 results on the web

prior research has

12,580,000 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:

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