2. 专升本
  3. The millions of calculations involved, ______by hand, would have lost all practical value by the time they were finished.

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

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问题 The millions of calculations 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
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