Which of the following is a polite action?
A.Playing the guitar late until 12∶00 at midnight．
B.Playing basketball in the room of a building．
C.Talking with friends quite a long time on the phone．
D.Waiting in line in the doctor's room．
网友回答
D解析根据问句“有礼貌的行为”是“在医生办公室里排队等候”。