putting/ tent/ up/ a/ are/ They/.Đoạn văn13/20 putting/ tent/ up/ a/ are/ They/.They are up putting a tent.They are a tent putting up.They are putting up a tent.They are a putting tent up.Giải thíchĐáp án đúng: C Dịch nghĩa: Họ đang dựng lều trại.