解析:本题是I am glad to see you 的感叹句形式,to see you 是原因状语,答案为B。 原则十、 非谓语动词的否定原则是在非谓语动词前加not,有not to do, not doing, not having done, not to have done几种形式 例23___that he was in great danger,Eric walked deeper ...