分析 The experts predicted that it would be at least one century before the human beings defeated computers,but the results showed that nineteen years was enough.
解答 The experts predicted that it would be at least one century before the human beings defeated computers,but the results showed that nineteen years was enough.
根据句意"专家曾经预测"以及"但结果表明"可知,这是对过去事实的叙述,所以用一般过去时即可.
本句为一个复杂的主从复合句,并两次用到了宾语从句,以及before引导的时间状语从句的运用.at least至少.
点评 对于复合句的灵活运用更能体现出一个学生的能力,适当的在一个句子中使用定语从句,宾语从句,介词短语作状语或者定语等结构.
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