Choose the appropriate word pair to complete the sentence.

I didn’t know Rahul was in the hospital. If I _____, I would _____ him.

The correct option is had known, have visited.

Explanation:

The sentence describes a hypothetical situation in the past. The first sentence, "I didn’t know Rahul was in the hospital," establishes that the event occurred in the past.

To express a hypothetical condition about the past and its imaginary result, we use the Third Conditional structure.

The structure of the Third Conditional is:

If + Past Perfect (had + past participle), ... would have + past participle

Applying this structure to the sentence:
- The condition part uses the past perfect: "If I had known..."
- The result part uses "would have" followed by the past participle of the verb: "...I would have visited him."

Therefore, the complete sentence is: "If I had known, I would have visited him." This matches the correct option perfectly.