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、bad they been done
B、they had been done
C、having been done
D、they were done

答案A

解析虚拟语气题。这是一句虚拟语气的句子，条件句使用了省if的倒装句形式，动作与过去事实相反。

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专业英语四级

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

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Summerisanidealtimeforjuniorstogetthejumponcollegeadmissionsessay.Theselesshurriedmonthsbeforethecomingof

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