单项选择题
A. During 9:00 a.m. and 5:00 p.m. from Monday to Friday. B. Between 8:00a. m. and 6:00 p.m. from Monday to Friday. C. In the period of 9:00 a.m. and 5:00 p.m. every day.
A. May 18th. B. May 8th. C. May 10th.
A. how B. why C. what D. which