单选题：The duality of the language is

题目内容：

The duality of the language is A．letters and sound
B．sounds and symbol
C．symbols and meanin
D．sounds and meanin

参考答案：

答案解析：

请在（6）处填上最佳答案。

请在（6）处填上最佳答案。A． progress B． absence C． presence 　　※考试大※在线-考试中心※ D． favor

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