本文讨论了现代通信的基本原理。

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本文讨论了现代通信的基本原理。

A.The paper discusses the fundamental principles of modern communication.

B.The paper discussed the fundamental principles of modern communication.

C.The paper will discuss the fundamental principles of modern communication.

D.The paper has discussed the fundamental principles of modern communication.

参考答案:

答案:The paper discusses the fundamental principles of modern communication.