[考試] 英文選擇難題
In 1983, researchers first ___ HIV, the virus responsible for AIDS.
(A)generated (B)identified 確認，證實，鑑定
(C)minimized (D)validated 使有(生)效，確認，證實
答案給B，為何D不能選，D也有確認，證實的意思？
感謝
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