-- Is it easy from my building to yours? Yes. And we look forward to you at the party.A

问题补充：

-- Is it easy from my building to yours?

-- Yes. And we look forward to you at the party.

A. to walk; seeing

B. to walk; to see

C. walking ; to see

D. walking ; seeing

答案：

(答案→)A. to walk; seeing

B. to walk; to see

C. walking ; to see

D. walking ; seeing

解析：句意：——从我的楼房走到你的楼房容易吗？——是的，容易。而且我们期望在聚会上看见你。It is easy to do sth.做某事容易，故第一空用动词不定式做真正的主语，故排除CD两项。look forward to doing sth期望做某事，故此处用动名词seeing。故选A。