"Why did she leave you?"
"She thought I cared more about playing golf than being with her."
"You spend/spent a lot of time on the golf course?"
"Yes. A couple of hours every day."
In the third line I would put a "did" before "spend/spent" so I guess it should be "spend", right? It's just Google has a lot of hits searching "Did you spent", but is that always wrong?
Yes, did you spent is always wrong.
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