强化物一般可分为五类:()、活动性强化物、操作性强化物、拥有性强化物、社会性强化物。 发布时间:2017-06-19 04:59 │ 来源:www.tikuol.com 题型:填空题 问题: 强化物一般可分为五类:()、活动性强化物、操作性强化物、拥有性强化物、社会性强化物。
题型:填空题 All the preparations for the project ______, and we're ready to start.A. completed B. had been completed C. complete D. have been completed 查看答案