【单选题】In Hunter's experiment, the rat had to remember______.
A.where the food was
B.how to leave the cage
C.how big the cage was
D.which light was turned on
【单选题】In Hunter's experiment, the rat had to remember______.
A.where the food was
B.how to leave the cage
C.how big the cage was
D.which light was turned on
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