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有一个英语句子无法理解Whethertheywillgobytrainorbyairhasn'tdecide.这句话为什么用hasn't而不用haven't?主语不是they吗?THANKVERYMUCH!

题目详情
有一个英语句子无法理解
Whether they will go by train or by air hasn't decide.
这句话为什么用hasn't而不用haven't?主语不是they吗?THANK VERY MUCH!
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答案和解析
主语不是they,
主语是“Whether they will go by train or by air ”即“乘火车还是乘飞机”这个问题,主语是单数.
顺便提一下,如果这个句子完整的话,我觉得应该是
Whether they will go by train or by air hasn't been decided.