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:
重點單詞 | 查看全部解釋 | |||
delay | [di'lei] |
想一想再看 v. 耽擱,推遲,延誤 |
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parallel | ['pærəlel] |
想一想再看 adj. 平行的,相同的,類似的,并聯的 |
聯想記憶 | |
determine | [di'tə:min] |
想一想再看 v. 決定,決心,確定,測定 |
聯想記憶 | |
approximately | [ə'prɔksimitli] |
想一想再看 adv. 近似地,大約 |
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gratification | [.grætifi'keiʃən] |
想一想再看 n. 滿足,喜悅 |
聯想記憶 |