C、Two monkeys were placed in separate but adjoining chambers.

本句话的核心/主句主干是___

However, when two monkeys were placed in separate but adjoining chambers, so that each could observe what the other was getting in return for its rock, their behavior became markedly different.

  • A、Each could observe what the other was getting.
  • B、Their behavior became markedly different.
  • C、Two monkeys were placed in separate but adjoining chambers.

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