JACK will be back_3hours,but his brother will be back_3

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JACK will be back___3hours,but his brother will be back___3 o,clock.为什么选in和after谢谢

in 后接时间段时,表示“在...之后”,用于将来时,而after后接时间段时,只能用于过去时.
后接时间点时,只能用after,in后面不能接时间点.after + 时间点的时态,没有确定的限制,可根据具体情况确定.
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JACK will be back___3hours,but his brother will be back___3 英语：His brother will be the ______ . jack will be twice ashis sister will be then 英语翻译 But it will be warmer Something will be changed!But something will be never. But then there will be more room for the new baby——a brother Jack’ parents hope that the businessman,Jack growing,will be His brother will be able to driver himself soon.Now he is ta whatever will be will be Whatever will be,will be "Whatever will be,will be? whatever will be,will be?