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

游客2024-12-29 31

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 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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