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Câu hỏi:

04/07/2026 3 Lưu

________ then what I know today, I would have saved myself a lot of time and trouble over the years.

A. Had I known

B. Did I know

C. If I know 
D. If I would know

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Trả lời:

verified Giải bởi Vietjack

Đáp án: A