I ___ this kind of car before.Where did you buy it 怎么填空?didn't see 还是haven't seen?

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I ___ this kind of car before.Where did you buy it 怎么填空?didn't see 还是haven't seen?
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I ___ this kind of car before.Where did you buy it 怎么填空?didn't see 还是haven't seen?
I ___ this kind of car before.Where did you buy it 怎么填空?didn't see 还是haven't seen?

I ___ this kind of car before.Where did you buy it 怎么填空?didn't see 还是haven't seen?
用现在完成时,haven't seen

单独一个before放句尾时,表示从以前到现在,应该用现在完成时,所以是haven't seen

I did't for love