A. Unless he had prepared well for his GCSE examination, he wouldn’t regret it now
B. But for his ill preparation for his GCSE examination, he wouldn’t regret it now
C. If it hadn’t been for his good preparation for his GCSE examination, he wouldn’t regret it now
D. If he had prepared well for his GCSE examination, he wouldn’t have regretted it now
B
Đáp án B
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