You                   use your mobile phone during the test. It's against the rules.

Câu hỏi :

You                   use your mobile phone during the test. It's against the rules.

A mightn't 

B mustn't 

C oughtn't 

D needn't

* Đáp án

B

* Hướng dẫn giải

Phương pháp giải:

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