题目列表(包括答案和解析)
The newly learnt words will soon be forgotten ________ frequently used in everyday communication.
A.if they are
B.unless they are
C.when they are
D.till they are
-- I can’t remember the English words I learnt yesterday.
--You know, the newly learnt words will soon be forgotten ______ frequently used in everyday communication.
A. if B. unless C. when D. till
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