Jack joined the army in 2006.(改为同义句)It ____ _____ three years _____ jack joined the army.

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Jack joined the army in 2006.(改为同义句)
It ____ _____ three years _____ jack joined the army.

has been,since
因为since所以前句用现在完成时
自从他加入军队已经三年了

is over,since

has been,since

has been,since

has been, since 他们都说对了,你可以不采用我的,我只不过想做一下这道题而已。谢谢

has been ; since

has been, since从过去持续到现在的动作用现在完成时