题目内容：
Allen and Beatrice Gardener managed to communicate with the chimpanzee by _________.
A． training the chimpanzee to learn human language in an entirely new method B． creating a language both man and the chimpanzee were able to use
C． using animal' s vocal language which the chimpanzee was able to understand
D． learning the chimpanzee's language with an entirely new approach
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