Three years __________ since my brother jioned the army.A.has passed B.have passed C.passed D.passes求列出详细解析,不甚感激.

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Threeyears__________sincemybrotherjionedthearmy.A.haspassedB.havepassedC.passedD.passes求列出详细解析,不甚感激.

Three years __________ since my brother jioned the army.A.has passed B.have passed C.passed D.passes求列出详细解析,不甚感激.
Three years __________ since my brother jioned the army.
A.has passed B.have passed C.passed D.passes
求列出详细解析,不甚感激.

Three years __________ since my brother jioned the army.A.has passed B.have passed C.passed D.passes求列出详细解析,不甚感激.
A
时间金钱作为整体,用单数
比如,20块钱对我足够了,20 yuan is enough
有since ,从句用过去式,主句用完成时

A 自从我的哥哥去参军已经过去两年了

选B

since引导的时间状语从句，主句用现在完成时，从句用过去时。

three years 复数主语所以用have

since 自从这是现在完成时的一个标志当它出现并翻译为自从时主句用现在完成时就是since前面的句子用完成时又由于三年是复数所以选b 翻译为自从我哥哥加入军队到现在已经过了三年了

B.have passed 当时间作主语时。有时谓语用单数，有时用复数。这取决于时间一个整体还是看成个体即多个。这句里的three years不是一整体而是表示多个，即我弟弟已参军三年了。所以一定用复数。再看下面例子 Ten years is not a long time in history.这句中的ten years要看成整体。谓语用单数。...

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