________ speech is the most obvious form of communication, we do use other forms to communicate. ( 章节：4 难度：3)
- A、Since
- B、When
- C、While
- D、As
正确答案:C
答案解析:有
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________ speech is the most obvious form of communication, we do use other forms to communicate. ( 章节：4 难度：3)
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