2. 外语
  3. As is often pointed out, knowledge is a two edged weapon which could be used equally for good or evil.

As is often pointed out, knowledge is a two edged weapon which could be used equally for good or evil.

admin2011-07-28  26
问题 As is often pointed out, knowledge is a two edged weapon which could be used equally for good or evil.
选项
答案could——can
解析 主句为现在时，而从句也不表示虚拟，所以此处应该用现在时。
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