2. 外语
  3. As ______ known to all, language has been developed through social contacts.

As ______ known to all, language has been developed through social contacts.

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问题 As ______ known to all, language has been developed through social contacts.
选项 A、is
B、are
C、though
D、if
答案A
解析 本题考查as的用法。as在本句中是个代词，指代后面的language has been developed through social contacts，表示这一说法众所周知。
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