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1 vote
I think that sign means we . . . . . enter the building. Look, there is a security guard too. A. mustn’t B. have to C. will D. don’t

User LaSul
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1 Answer

7 votes
By filling the blank we will get ''I think that sign means we mustn't enter the building. Look, there's a security guard too''.

Explanation: Correcting the sentences requires the proper use of grammar.
User Musmahn
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