________ speech is the most obvious form of communication, we do use other forms to communicate. ( 章节：4 难度：3)_做题室

单项选择题________ 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：
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