The British political system (evolution) ______ over several centuries.has evolv

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问题 The British political system (evolution) ______ over several centuries.

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答案 has evolved

解析本句缺少谓语动词，所以evolution应用动词形式evolve，意为“进化，发展”，而且后面是延续性时间状语，所以用现在完成时，表示此动作还可能继续下去。

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