答案:D
解析:
Choice D is the best answer because the verb "wait" maintains parallel structure with the verb "receive." In short, the chimpanzees could either receive or wait.
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答案:D
解析:
Choice D is the best answer because the verb "wait" maintains parallel structure with the verb "receive." In short, the chimpanzees could either receive or wait.
重点单词 | 查看全部解释 | |||
gratification | [.grætifi'keiʃən] | 联想记忆 | ||
delay | [di'lei] | |||
parallel | ['pærəlel] | 联想记忆 | ||
approximately | [ə'prɔksimitli] | |||
determine | [di'tə:min] | 联想记忆 |