二、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，选出一个可以填入空白处的最佳答案。
16. —What’s wrong with you ?
—I had ________ bad headache and had to stay in ________ bed.
A. a, 不填 B. 不填, the C. a, the D. 不填, 不填
17. —You’ve left the light on.
—0h，sorry．_____and turn it off.
A. I’ve gone B. I’11 go C. I went D. I’m going
