Not until I got on the taxi to the airport that I realized I had left my passport at home

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Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction in each of the following questions

that I realized

that I had left

at home

got on

Giải thích

Cấu trúc đảo ngữ nhấn mạnh: Not until + mốc thời gian/mệnh đề quá khứ + did/could + S + V không chia. A -> did I realize