Do you work in this university?------No,I____it for 3 daysA just visit B am just visiting C had already visited D just visited 为什么选B

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Do you work in this university?------No,I____it for 3 days
A just visit B am just visiting C had already visited D just visited 为什么选B

这里用现在进行时态表示将来时.
意思是:你在这所大学工作吗?不,我只是即将在该大学访问三天(可能是当访问学者吧).
相类似的例子是:i am coming back in 3 days.我将在三天后回家.