What are you doing? Don't you know that you _______ write on the desks? A. don't have to B. mustn't C. needn't - Grammar | English Grammar Quiz

What are you doing? Don’t you know that you _______ write on the desks?

A. don’t have to

B. mustn’t

C. needn’t

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Past Participle There vs. It Subject-Verb Agreement

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