Fill in the blank with the correct preposition.
The old man is yet to recover ______ his illness.

Correct option is C

The correct option to fill in the blank is (c) from.
• The verb recover takes the preposition from when we talk about illness, injury, shock, loss, etc.
• “Recover from an illness” is a fixed and correct usage.
• Hence, “recover from his illness” is grammatically correct.
Correct sentence:
• The old man is yet to recover from his illness.
Grammatical Rule Used (English):
• Fixed collocation: recover from + illness/disease/injury/shock.
Grammatical Rule Used (Hindi):
• “Recover” के साथ बीमारी/चोट आदि के लिए सही preposition from होता है।
• सही प्रयोग: recover from illness (बीमारी से ठीक होना)।
Meanings of the other options:
• (a) With: used for association/togetherness (के साथ)
• (b) Of: used for relation/belonging (का/के/की)
• (d) Off: used for separation/removal (से हटकर/उतारकर)