Furthermore, botox causes muscles to lose their movement, leading people who have had this procedure occasionally to lose some facial expressions, such as the ability to frown.

어법상 틀린것을 고르라는 문제엿는데요 저는 occasionally 뒤의 lose 가 문장의 동사라고 생각해서 틀렷다고 골랏는데 맞는문장이네요ㅠㅠ 그럼 동사가뭔가요?