Ben Roethlisberger had his best completion percentage in a game when he had 30 or more (ATT+ATT) versus the Panthers on November 8, 2018, at 88.0 percent.

what is ben roethisberger's highest completion percentage in a game with 30+ pass + attempts
Interpreted as:
What is ben roethisberger's highest completion percentage in a regular-season game with 30+ pass + passing attempts?

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