Subgroups of $SL(n,F)$ which contain $B\cap SL(n,F)$

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If $B$ is the usual Borel subgroup of $GL(n,F)$, then what are the subgroups of $SL(n,F)$ which contain $B\cap SL(n,F)$? I don't even know where to start! Any help is appreciated! :)