Question
Following question consists of a sentence with three underlined parts labelled (a), (b) and (c). Read the sentence to find out whether there is any error in any underlined part. If you find no error, your response should be indicated as (d).
He waved us a by-by–––––––––––––––––––––––(a) as he boarded the train–––––––––––––––––––––––––(b) which disappeared into the tunnel–––––––––––––––––––––––––––––––––––––(c). No error–––––––––(d)