Their calculations would have been more accurate______(如果当时有电脑的话).had It been fo

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问题 Their calculations would have been more accurate______(如果当时有电脑的话).

选项

答案 had It been for the computer／if it had been for thecomputer

解析 ①根据句意和主句中的would have been可知，本句是与过去事实相反的虚拟语气，条件状语从旬的谓语动词应使用"had+过去分词”的形式；②非真实条件句中，可以把从句中的if去掉，直接把谓语动词当中的情态动词或者助动词提前，构成倒装句。

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Wereitimpossibletomakeaccuratemeasurement,__________________(这样的高精度就不可能达到