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 cooperative if feeling cheated[D] are unhappy when separated from others
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 cooperative if feeling cheated
[D] are unhappy when separated from others
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