求教2道关于现在分词做状语的英语题目,谢谢

题目

求教2道关于现在分词做状语的英语题目,谢谢
1.When _______,the bridge connecting the island to the continent will be open to traffic next year.
A.completed B.completing C.being completed D.to be completed
我选择的是C,可是答案不对,我想不明白的是 这里的When不是时间状语吗?那为什么不能用being done?
2._______of danger in the street at night,she had to go home,with a friend_____
A.Warned , followed B.Warning,following C.Having warned,following D.Having been warned, following
我这个选择了A.可是杯具的是答案也不对.
求解释这是为什么.越详细越好
的确漏打了一个her...不好意思

答案