A. may have picked up B. could be picked up C. must be picking up D. should have picked upĐoạn văn74/83Mark the letter A, B, C, or D on your answer sheet to indicate the correct option that best fits each of the numbered blanks from 72 to 77.may have picked up could be picked up must be picking up should have picked upGiải thíchChọn đáp án A