Quote:
Originally Posted by Purple Lady
I'm in the US and I also thought "which" was wrong, but I wasn't sure why so I didn't comment on it.
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The general rule is "would it change the meaning of the sentence if the clause were removed?" If so, use THAT; otherwise, use WHICH.
Also, clauses with WHICH generally are set off with commas, while using THAT doesn't add a comma (after all, it isn't an incidental clause that can be removed...).