Excuse me, when did the school library open?<br />It opens at 8 o'clock from Monday to Thursday.<br />On Friday morning, the library always does some cleaning,<br />so it opens half an hour later than usual.<br />What about weekends?<br />At 9.30.<br />Question<br />When did the school library open on Friday morning?
A . At 8:00 am.B . At 8:30 am.C . At 9:00 am.D . At 9:30 am.
