What is the grammatical function of "must have known" in the sentence: "Regulators must have known about the West Texas oil fields long before it became public"?

Question

Accepted Answer

It expresses logical certainty about a past event based on available evidence.

Answer

It expresses doubt about whether regulators had access to relevant information.

Answer

It expresses a missed opportunity to gain knowledge about the situation.

Answer

It expresses regret that regulators did not know about the oil fields sooner.

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What is the grammatical function of "must have known" in the sentence: "Regulato...

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