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