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Choose the word or phrase that best fits the gap in each of the following sentences. Write A, B, C, or D on your answer sheet. All motorcyclists must wear helmets. It is for them to wear hel

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Choose the word or phrase that best fits the gap in each of the following sentences. Write A, B, C, or D on your answer sheet.

All motorcyclists must wear helmets. It is for them to wear helmets.

official

compulsory

optional

separate

Giải thích

B. compulsory