If you don't have any connecting word there (neither that nor where ), then that is assumed, and you have to follow the grammatical rules as if that were the connector. What's the most expensive restaurant (that) you have ever been to? What's the most expensive restaurant where you have ever been?
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CalifJimWhat's the most expensive restaurant where you have ever been?You think this is OK then? That's curious; to me it sounds quite wrong.
Mr WordyYou think this is OK then? That's curious; to me it sounds quite wrong.Not a US/UK thing. I doubt it anyway. I accept it only pedagogically as a contrast to the structure with or without that, which requires the toat the end. In itself, it's a dog of a sentence, I agree. It's just barely
Is this a US/UK thing perhaps?
Mr WordyI consider it bad as well. The problem comes from where and been in the same clause and the fact that a short visit is implied. Where is equCalifJimWhat's the most expensive restaurant where you have ever been?You think this is OK then? That's curious; to me it sounds quite wrong.
KentaThen how about this?OK to me, but not terribly conversational. In practice I would say:
What's the most expensive restaurant to which you have ever been?