Though __ of danger ,sightseers have been flocking to the site where Bin Laden lived.为什么填warned 而不是 being warned?

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Though __ of danger ,sightseers have been flocking to the site where Bin Laden lived.为什么填warned 而不是 being warned?

Though __ of danger ,sightseers have been flocking to the site where Bin Laden lived.为什么填warned 而不是 being warned?
Though __ of danger ,sightseers have been flocking to the site where Bin Laden lived.
为什么填warned 而不是 being warned?

Though __ of danger ,sightseers have been flocking to the site where Bin Laden lived.为什么填warned 而不是 being warned?
though在此作连词,完整句子应是though they are warned of danger,动词warn与sightseers为被动关系.如果想用being+过去分词作状语 则不需要though 这涉及主语省略问题啦 反正though引导从句必须有主语

因为后面有主语还有have been flocking to 现在完成进行时 前面不应重复

being有进行的含义。

因为是被动语态,而且缺主语