第一节：单项填空（共15小题；每小题1分，满分15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. Tom overslept this morning and didn’t get up until 11am because he ____ to work, it’s Sunday today.
A. didn’t need to go B. needn’t go
C. needn’t have gone D. needn’t to go
2. ---You look tired, what’s wrong?
---Well, I ____ the wall the whole day and it hasn’t been finished yet.
A. have painted B. have been painting
C. have been painted D. am painting
