选择题 (共40分)
一、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，并在答卷纸上将该项涂黑。
1. Thousands of people took part in the Spring Niushou International Marathon _________ April 16, 2017 in Jiangning.
A. on B. in C. / D. at
2. The pencil case must be Mary’s. Look! _________ name is on the cover.
A. His B. Her C. Its D. My
3. —_________ did you work out the physics problem in such a short time?
