_________ at his lessons, still he couldn't catch up with his classmates. A. Hard as he was B. Hard as he does C. Hardly as he worked D. Hard as he workedĐoạn văn14/87_________ at his lessons, still he couldn't catch up with his classmates.Hard as he wasHard as he doesHardly as he workedHard as he workedGiải thíchChọn D