If he _____ harder, he would have passed the exam.
Đáp án B
Cấu trúc câu điều kiện loại 3:
If + S + had+ Vpp/ Ved…, S + would/ could/ might + have + Vpp/ Ved
Câu điều kiện không có thật ở quá khứ
Dịch: nếu anh ấy học chăm chỉ hơn thì anh ấy đã thi đậu rồi.
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