you can stay here __you keep quietA as long as B unless

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you can stay here __you keep quietA as long as B unless
you can stay here __you keep quiet
A as long as B unless

you can stay here __you keep quietA as long as B unless
选择A.只要…… B是除非的意思,不合适.
句意:只要你保持安静,就能够留在这里.