Only when he arrived at the airport ________ that he had left his passport home

Câu hỏi :

Only when he arrived at the airport ________ that he had left his passport home.

A. did he realize         

B. he realized        

C. had he realized 

D. he was realized

* Đáp án

A

* Hướng dẫn giải

Đáp án A

Cấu trúc đảo ngữ : Only when+……+ auxiliary + S + V: Chỉ khi....

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