Indicate the underlined part that needs correction: My elder (A) sistersĐoạn văn26/39Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. My elder (A) sisters, both of them (B) were doctors, said they were too busy (C) to pick (D) me up.elderboth of themtoo busyto pickGiải thíchĐáp án B.