Have them talk through the lead to sale cycle - then ask a few questions at a field level (can they understand what a rep is actually facing; handoffs; marketing hook vs sales value & closing messaging) and exec level (when do you turn the dial on volume/quality; discussion on messaging’s alignment to goals ie ACV, volume, channels).
There is no golden bullet question - if you are at superficial question level, you will get superficial answers - and a lot of people can blag at the 101 level.