单选题：An understanding of English

题目分类：综合类
题目类型：单选题
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题目内容：

An understanding of English A．that of a speech community
B．can a speech community be formed
C．in order to learn English better
D．for the sake of simplicity
E．has played an important role in the field of education
F．is widely used in several areas of public activity

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答案解析：

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