单选题：The millions of calculations involved，__________by hand，wou

题目分类：专四
题目类型：单选题
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题目内容：

The millions of calculations involved，__________by hand，would have lost all practical value by the time they were finished． A．had they been done
B．they had been done
C．having been done
D．they were done

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分类：专四题型：单选题

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