Mark the letter A, B, C, or D on your answer sheet to show the underlined, part that needs correction.
Trả lời câu hỏi dưới đây:
The nutritionist told him to avoid eating lots of carbohydrates, focus having more protein-rich foods and green vegetables, and drink at least eight glasses of water a day.
B -> focus on + V-ing: Tập trung vào làm gì.