Hardly he had graduated from Vietnam Naval Academy when he joined Vietnam Coast Guard. A. he had B. graduated from C. when D. joined

Đáp án A.

Sửa thành Had he. Đây là cấu trúc đảo ngữ với hardly … when:

 

She had hardly sat down when the phone rang. → Hardly had she sat down when the phone rang: Ngay khi cô ấy ngồi xuống thì điện thoại kêu.