You are not permitted to use your mobile phones during the test. A. You shouldn’t use your mobile phones during the test. B. You may not use your mobile phones during the test. C. You m

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You are not permitted to use your mobile phones during the test.

You shouldn’t use your mobile phones during the test.

You may not use your mobile phones during the test.

You mustn't use your mobile phones during the test.

You don’t have to use your mobile phones during the test.

Giải thích

Giải thích: be not permitted = mustn’t

Tạm dịch: Bạn không được phép sử dụng điện thoại di động của mình trong quá trình kiểm tra.

Choose C.