Athletes（ ）at the Olympic Games are supposed to be nonprofessionals.
A.
who compete
B.
who are competing
C.
who will compete
D.
who have competed
正确答案是A
Athletes（ ）at the Olympic Games are supposed to be nonprofessionals.
Athletes（ ）at the Olympic Games are supposed to be nonprofessionals.
A.
who compete
B.
who are competing
C.
who will compete
D.
who have competed
正确答案是A