Mark the letter A, B, C, or D on your answer sheet to indicate the cor

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

It is about time you ______ harder for the next exam.

• A. A. work
• B. B. worked
• C. C. are working
• D. D. have worked

Theo công thức It is about time + S + V (QKĐ): đã đến lúc phải làm gì đó.