第二部分：英语知识运用（共三节, 满分70分）
第一节：单项填空（共20小题，每小题1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，并在答题卡上将该项涂黑。
21．Mrs Black doesn’t believe her son is able to design a digital camera, ______?
A. is he B. isn’t he C. doesn’t she D. does she
22. Don’t be too hard _____ him, though he is supposed _____ here already. There must have been something wrong.
A. on; to have been B. on; to be
C. with; to have been D. with, to be
