一、单项填空（共25小题；每小题1分，满分25分）
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
1.Lianzhan said that people in Taiwan and Mainland must try hard to understand each other, and ______ misunderstanding.
A. do away B. do up C. clear away D. clear up
2.He narrowly missed being seriously hurt, if not______, by the explosion.
A. killed B. being killed C. be killed D. to be killed
3.Susan ______for three years to be a computer analyst but found her progress discouraging .
A. has worked B. worked C. had worked D. was working
4.Few people paid full attention to their health conditions _____ they were seriously ill.
A. when B. if C. until D. before |
