问题标题：
Asisknowntoalllanguagelearnersthenewlylearntwordswillsoonbeforgottenunless____usedineverydaycommunicationAgraduallyBextremelyCexactlyDfrequently
问题描述：
Asisknowntoalllanguagelearnersthenewlylearntwordswillsoonbeforgottenunless
____usedineverydaycommunication
AgraduallyBextremelyCexactlyDfrequently
蔡颖回答：
D(A是逐渐的；B是极端的；C是精确地,恰好的；D是频繁的）
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