they perfected
Past they conjugation of perfect.
See all conjugations of perfect

perfect

Maybe they perfected it by now.
Peut-être qu'ils l'ont perfectionné à présent.
They perfected and consecrated this nationalism and made it the true essence of their 'socialism'.
Ils ont perfectionnés et consacré ce nationalisme pour en faire la véritable essence de leur « socialisme ».
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