It was not until the students were seated _____ the proctor realized that he had the wrong test booklets.

Câu hỏi :

It was not until the students were seated _____ the proctor realized that he had the wrong test booklets.

A that      

B when   

C as soon as    

D and

* Đáp án

A

* Hướng dẫn giải

Phương pháp giải:

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