Final answer:
The correct form to complete the sentence is 'nos gusta'. 'Gustar' is a Spanish verb that means 'to like'.
Step-by-step explanation:
The correct form to complete the sentence is nos gusta.
'Gustar' is a Spanish verb that means 'to like'. In this case, since the subject 'us' (a nosotros) is singular, we use the singular form, which is 'gusta'.
For example, you can say 'A nosotros nos gusta jugar al fútbol' which translates to 'We like to play soccer.'
Learn more about Spanish Verbs