1. I am sorry I missed ____ you while in Beijing.

a. to see   b being seen   c. seeing   d. having seen 

2. I remembered _____ the door before I left the office, but forgot to turn off the lights.

 a. locking   b to lock   c having locked   d. to have locked

红色都是正确的。第一题，having seen 无法早于 missed，所以判为错误，第二题，不定式的完成体早于谓语动词，所以也为正确。

没看见是专门向曹老师提问的，权当我替曹老师解答了。