Trắc nghiệm tổng hợp ôn thi tốt nghiệp THPT môn Tiếng Anh Chuyên đề III. Đọc điền thông tin, thông báo, quảng cáo có đáp án
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He regretted not _______ harder when he was at high school. A. having studied B. to have studied C. studied D. study

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He regretted not _______ harder when he was at high school. 

having studied

to have studied

studied

study

Giải thích

Chọn đáp án A