We also use other forms of communication ________ we may be aware or unaware. ( 章节：4 难度：3)_做题室

单项选择题We also use other forms of communication ________ we may be aware or unaware. ( 章节：4 难度：3): A、to which; B、of which; C、which; D、that

正确答案：B
答案解析：
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