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【单选题】

Themillionsofcalculationsinvolved，byhand，wouldhavelostallpracticalvaluebythetimetheywerefinished.（）
A.hadtheybeendone
B.theyhadbeendone
C.havingbeendone
D.theyweredone

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根据网考网移动考试中心的统计，该试题：

72%的考友选择了A选项

13%的考友选择了B选项

12%的考友选择了C选项

3%的考友选择了D选项

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