◎ 题干
He is a teacher. He has been a teacher ____ 1990.
A.inB.untilC.sinceD.For
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“He is a teacher. He has been a teacher ____ 1990.A.inB.untilC.sinceD.For…”主要考查了你对  【介词短语】【介词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。