单项选择题
W: I hope the library will be open on Saturday.
M: The sign says, "library hours: weekdays 8:00 a. m. to 9:00 p. m. , on Saturdays 9:00 a. m. to 5:00 p. m. , closed on Sundays. "
A. 9:00 to 5:00
B. 8:00 to 9:00.
C. 5:00 to 9:00
D. 5:00 to 9:00