2. 自考
  3. The millions of calculations involved, had they been done by hand, ______all practical value by the time they were finished.

The millions of calculations involved, had they been done by hand, ______all practical value by the time they were finished.

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问题 The millions of calculations involved, had they been done by hand, ______all practical value by the time they were finished.
选项 A、could lose
B、would have lost
C、might lose
D、ought to have lost
答案B
解析 本题考查虚拟语气的用法。句意：所涉及的数百万次的计算，若用手工进行，等到完成时恐怕早就失去一切实用价值了。在本句中，从句省略了if，把had提到了前面，变成了倒装句式。由于本句是与过去事实相反的假设，条件句的谓语动词用“had+过去分词”，主句的谓语动词用“would have done”。故选B。
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