根据网考网考试中心的统计分析，以下试题在2015-12-17日专四专八考试专四考试习题练习中，答错率较高，为：31%
【单选题】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
网考网参考答案：A，答错率：31%
试题解析：点击查看解析
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