As is often pointed out, knowledge is a two-edged weapon which could be used equ

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

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答案时态错误，应把could改为can。

解析主句knowledge is a two-edged weapon已经显示出时态应为现在时，而从句也不表示虚拟，所以也应该用现在时。本句的意思是“正如人们经常指出的那样，知识是把双刃剑，可以用来造福，也可以用来为害。”

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Asisoftenpointedout,knowledgeisatwo-edgedweaponwhichcouldbeusedequ