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 mustn't     

B oughtn't 

C mightn't

D needn't

* Đáp án

A

* Hướng dẫn giải

Phương pháp giải:

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