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Bythetimeyourplanelandstonight,Iattheairportfor3hoursAhadwaitedBhavebeenwaitedChadbeenwaitingDwillhavebeenwaiting为什么是D,for3hours不是完成时态的标志吗?

题目详情
By the time your plane lands tonight ,I____at the airport for 3 hours
A had waited
B have been waited
C had been waiting
D will have been waiting
为什么是D,for 3 hours不是完成时态的标志吗?
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答案和解析
很高兴能够在这里回答你的问题,填写
确实选D
这个句子的时态是将来完成时
首先发生在飞机着陆时,现在还没有着陆,所以要用将来时
正如你所说,for 3 hours,所以要用完成时态
所以用将来完成时态 will have done