________ more carefully, he would not have had the accident yesterday. Unless

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________ more carefully, he would not have had the accident yesterday.

Unless he had not driven

If had Peter driven

Had Peter driven

If Peter has driven

Giải thích

Đáp án C

Đảo ngữ câu điều kiện loại 3 - điều kiện không có thật trong quá khứ:

Had + S1 + (not) + past participle, S2 + would/might/could… + have + past participle

Dịch nghĩa: Nếu Peter đã lái xe cẩn thận hơn, anh sẽ không gặp tai nạn hôm qua.