高等教育 / 英语（二）
(单选题) The trainer usually gives the animal a piece of candy or fruit _ _ _ _ _ _ _ .( )
A、before it plays a trick
B、when it is hungry
C、after it has done the trick
D、when it starts to play a trick
A、before it plays a trick
B、when it is hungry
C、after it has done the trick
D、when it starts to play a trick
参考答案：
佳题速递：