The correct answer is OPTION 4 - "should have visited/felt"
You should have visited an ENT as soon as you felt this irritating pain.
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"Should have visited" is used to indicate a past obligation or a missed advisable action. This means that visiting the ENT was the right thing to do, but it was not done at the correct time.
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"Felt" is the correct past tense of "feel" because the sentence refers to a past situation.
OTHER OPTIONS
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"Could visit/feel" (Incorrect, as "could visit" suggests possibility rather than obligation.
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"Might visit/feel" (Incorrect, as "might visit" expresses uncertainty rather than a strong suggestion.)
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"Had to visit/feel" (Incorrect, as "had to visit" would imply a compulsion rather than advice for a missed action.)
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