题目内容
（请给出正确答案）
[主观题]
Dr. Brosnan and Dr. de Waal have eventually found in their study that the monkeys ______.A
Dr. Brosnan and Dr. de Waal have eventually found in their study that the monkeys ______.
A．prefer grapes to cucumbers
B．can be taught to exchange things
C．will not be co-operative if feeling cheated
D．are unhappy when separated from others
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