Fill in the blank with the correct preposition: ‘She is keen ___ learning new languages.’

Explanation

The adjective ‘keen’ is conventionally followed by the preposition ‘on’ when describing an enthusiasm for something, as in ‘keen on learning new languages’ or ‘keen on sports.’ This fixed collocation is commonly tested alongside similar expressions of enthusiasm like ‘interested in’ and ‘fond of.’ Explore more English MCQs on mcqstutor to keep practicing.