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文意が通るように、文法上、追加すべき一語を教えていただきたいです🙏

) You must make certain the doors of the auditoriurm are not locked when it is use.

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when it is use

when it is in use(使用中)
にすればいいと思うわ
だから、inが必要な単語です🤗

さ な

回答ありがとうございます
理解できました!

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