Bob promised picking me up on Saturday night to the concert, but then he changed his mind.Đoạn văn21/45Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction in each of the following questions. Bob promised picking me up on Saturday night to the concert, but then he changed his mind. thento the concertpicking me upchangedGiải thíchChọn C