IV:
Choose the letter A, B, C or D to indicate the correct answer to each of the following questions.
Trả lời câu hỏi dưới đây:
Only when he arrived at the airport ________ that he had left his passport home.
Đáp án là A. Cấu trúc đảo ngữ : Only when+ ….. + auxiliary + S + V: Chỉ khi ….