According to the rules of the game ,each competitor__wear a number

问题描述:

According to the rules of the game ,each competitor__wear a number
A can B shall C may D could

选B
(用在条约、规章、法令等文件中表示义务或规定,一般用于第三人称)应,必须
Intruders shall be punished.
非法闯入者将遭处罚.