第一节：单项填空（共15小题；每小题1分，满分15分）
1. Unfortunately, when I dropped in, Doctor Li _____ for Beijing to join in the fight again H1N1, so we only had time for a few words.
A. just left B. has just left C. is just leaving D. was just leaving
2．He hasn't come yet.What do you consider _______ to him？
A．happens B．has happened C．happening D．to happen
