1. The officers narrowly escaped ___________in the hot battle.
 A. have killed B. to kill C. to be killed D. being killed
2.___________ the letter, he went out to post it.
 A. Writing B. Being writing C. Having written D. Written
3. Don't you remember ___________ ?
 A. seeing the man before B. to see the man before
 C. saw the man before D. to have seen the man before