……….., he would have been able to pass the exam.
A. If he studied hard
B. If studying hard
C. If he were studying hard
D. Had he studied hard
Câu trả lời là: D là đáp án đúng
Công thức nguyên hàm và tích phân
……….., he would have been able to pass the exam.
A. If he studied hard
B. If studying hard
C. If he were studying hard
D. Had he studied hard
Câu trả lời là: D là đáp án đúng