B
绝对正确!
不懂的话,我可以给你细讲.
Yuan Ming Yuan,destroyed by the foreign invaders,used to be a beautiful park.
这是一个定语从句.
完整的是这样的
Yuan Ming Yuan,which was destroyed by the foreign invaders,used to be a beautiful park.
which was destroyed by the foreign invaders做定语,修饰Yuan Ming Yuan
而Yuan Ming Yuan在定语从句中做宾语,因此可以省略先行词which,也就有了上面那个句子.