2. 外语
  3. The calculations would have been useless when they were worked out ______ (如果当时没有电脑的话).

The calculations would have been useless when they were worked out ______ (如果当时没有电脑的话).

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问题 The calculations would have been useless when they were worked out ______ (如果当时没有电脑的话).
选项
答案had it not been for the computer/if it had not been for the computer
解析 ①根据句意，本句是与过去事实相反的虚拟语气，缺少条件状语从句，所以从句的谓语动词应使用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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大学英语六级

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