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问题: 翻了一倍是has加什么

解答:

应该是has doubled 如
As a result, daily output has doubled.
结果日产量翻了一番。
In experimental plots the yield has been doubled.
在试验田里,产量已(被)提高了一倍。
The number of pigs and poultry has doubled.
生猪和家禽增加了一倍。