第I卷（满分85分）
第一节 单项填空（共15小题；每小题1分，满分15分）
从每题所给的A、B、C、D 四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21. ---_________?
---I’m not sure, but he might have been ill in bed.
A. What do you think has happened to Tom
B. What do you think Tom has happened
C. Do you think what has happened to Tom
D. Do you think what Tom has happened
22. Such a chance, once , might never come again.
A. being lost B. losing C. lost D. to be lost
