2. 考研
  3. The millions of calculation involved, ________ by hand, would have lost all practical value by the time they were finished.

The millions of calculation involved, ________ by hand, would have lost all practical value by the time they were finished.

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问题 The millions of calculation involved, ________ by hand, would have lost all practical value by the time they were finished.
选项 A、had they been done
B、they had been done
C、having been done
D、they were done
答案A
解析 本题考查虚拟语气。由主句谓语would have done可知，这是与过去事实相反的虚拟语气，故if条件句的时态应该是过去完成时，省略if则需要倒装，故答案为A项。句意为：所涉及的数百万次计算，如果全部人工计算的话，等计算完了也没有实际意义了。
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