Đáp án A.
Câu điều kiện loại 3 diễn tả tình huống không thể xảy ra ở quá khứ.
If + S + had PII, S + would have PII = Had + S + PII, S + would have PII
Dịch: Nếu bạn đến sớm hơn 10 phút, bạn đã có chỗ ngồi tốt hơn.
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