He is interested _____ learning new languages.

He is interested _____ learning new languages.

• A. In
• B. On
• C. To
• D. About

Answer: (A)

This question tests the fixed collocation after the verb interested. We say someone is interested in something, not on, to, or about. Here, the thing that interests him is the activity of learning, so learning comes after the preposition in as a gerund (learning). That makes the natural, grammatical form: He is interested in learning new languages. Using a different preposition doesn’t fit this pattern. On and about aren’t used with interested in this way, and while some speakers occasionally hear or say "interested to hear," the standard and most natural construction in this context is in followed by the -ing form.

This question tests the fixed collocation after the verb interested. We say someone is interested in something, not on, to, or about. Here, the thing that interests him is the activity of learning, so learning comes after the preposition in as a gerund (learning). That makes the natural, grammatical form: He is interested in learning new languages.

Using a different preposition doesn’t fit this pattern. On and about aren’t used with interested in this way, and while some speakers occasionally hear or say "interested to hear," the standard and most natural construction in this context is in followed by the -ing form.