As is known to all language learners, the newly learnt words will soon be forgotten unless they are used in everyday munication.
A. gradually
B. sincerely
C. hopefully
D. frequently
网友回答
A. gradually
B. sincerely
C. hopefully
(答案→)D. frequently
解析：本题的含义是所有的语言学习者都知道，如果我们在日常的交流中，不能频繁地使用所学的新单词，那么它们会被很容易忘记。frequently表示频繁地意思，故本题选D。