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搜题/搜资源
【单选题】【消耗次数:1】
The millions of circulations involved, _____ by hand, would have lost all practical value by the time they were finished.
①
had they been done
②
they had been done
③
having been done
④
they were done
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【单选题】
The millions of circulations involved, _____ by hand, would have lost all practical value by the time they were finished.
①
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they had been done
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having been done
④
they were done
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【单选题】
The millions of calculations involved, ____ by hand, would have lost all practical value by the time they were finished.
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had they been done
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