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题目内容
（延安大学-大学英语4）
The trainer usually gives the animal a piece of candy or fruit （ ）.
(本题3.0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
(本题3.0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
参考答案