题目内容

As is known to all language learners, the newly learnt words will soon be forgotten unless ______ used in everyday communication.
A.graduallyB.selflesslyC.fluentlyD.frequently
D
副词辨析。gradually逐渐地;selflessly自私地;fluently流利地;frequently频繁地;句意:新学的单词如果在日常交流中没有被频繁地使用,将很快被忘记。
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