第二节：语法和词汇知识（共15小题；每小题一分，满分20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，并将答案写在答题卡上。
6—She must have gone back to the valley.
—No, she_________. The entrance to it was nowhere to be found.
A. mustn’t B. needn’t C. couldn’t D. may not
7. ________in a white uniform, he looks more like a cook than a doctor
A. Dressing B. Dressed C. Being dressed D. Having dressed
