Experience with sleepovers with ~た+ことがある

Grammar Explanation

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Cocoa thinks Rize is nervous about staying overnight, but Rize explains she’s hasn’t had experience with a sleepover except for camping out in the wild with her father’s group, so this is her first time sleeping over with friends.

「いや… 親父(おやじ)部下(ぶか)(さそ)われたワイルドなキャンプしか経験(けいけん)した(こと)ないから…」