等高距越小,表示相应的坡度越()。 A.缓 B.小 C.平 D.陡 发布时间:2019-03-07 16:52 │ 来源:www.tikuol.com 题型:单项选择题 问题: 等高距越小,表示相应的坡度越()。A.缓B.小C.平D.陡
题型:单项选择题 ----- As we know, you won’t go back to the USA since you have established a research center here.But how long _____ in America? ----- For almost 10 years.A.did you studyB.have you studiedC.were you studyingD.have you been studying 查看答案