A. helps keep the streets cool B. keeps helping the streets cool C. keeps the streets helped to be cool D. helps and keeps the streets coolĐoạn văn80/83Mark 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 78 to 83.helps keep the streets cool keeps helping the streets cool keeps the streets helped to be cool helps and keeps the streets coolGiải thíchChọn đáp án A