Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions
I didn't know you were coming, so I didn't wait for you
A. Had I known you were coming, I would have waited for you
B. If I knew you were coming, I would wait for you
C. Were I to know you were coming I would wait for you
D. If I had known you were coming, I would wait for you
Đáp án là A. Câu thực tế chia ở quá khứ => câu điều kiện loại III: If + S + had(not) + PII, S + would(not) + have + PII.
Đảo ngữ câu điều kiện loại III: Had + S (+ not) + PII, S + would(not) + have + PII