18. (单选题) The trainer usually gives the animal a piece of candy or fruit （）. (本题1.0分) 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

18. (单选题)
The trainer usually gives the animal a piece of candy or fruit （）.

(本题1.0分)
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

出自：河南城建学院大学英语四

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