A.To learn a language well requires a lot of practice.B.Listening and speaking are very

外语类 成人英语三级 已帮助 人

A.To learn a language well requires a lot of practice.

B.Listening and speaking are very important.

C.Understanding the culture helps language learning.

D.A foreign language is always hard to learn

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热搜:a是b的充分条件,b是a的必要条件吗