'Zeba is going to France; she must tub up her French'. Here 'rub up' refers to--
'Zeba is going to France; she must tub up her French'. Here 'rub up' refers to-- Correct Answer improve knowledge in a subject
'Zeba is going to France; she must tub up her French'. Here 'rub up' refers to-- Correct Answer improve knowledge in a subject