Not until _____ the cartoonist _____ why he was popular with the public.

Câu hỏi :

Not until _____ the cartoonist _____ why he was popular with the public.

A did I meet – that I realized 

B I met – that I could realize

C had I met – could I realize    

D I had met – did I realize

* Đáp án

D

* Hướng dẫn giải

Phương pháp giải:

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