小明计算20道竞赛题，做对一道的5分，做错一道倒扣3分，结果小明考得60分．问： 发布时间：2017-06-06 22:18 │ 来源：www.tikuol.com 题型：解答题 问题： 小明计算20道竞赛题，做对一道的5分，做错一道倒扣3分，结果小明考得60分．问：他一共做对了______道题．
题型：解答题 — This returned Chinese scholar has become one of the top experts in this field. — Yes. I know him very well. He _____ in Africa with wild animals for eight years.A. is working B. had worked C. workedD. has been working 查看答案