题型:问答题 简答题 —Do you love teaching, Miss He?—I fell in love with teaching in 2000. I ________ for twelve years by this summer.A.will teachB.would have taughtC.has been teachingD.will have been teaching 查看答案
题型:问答题 简答题 甲、乙两台抽水机共同工作,10/小时能把池中水抽干,共同工作4小时后,甲抽水机停止抽水,由乙抽水机单独工作,经过18小时抽完池中剩水,则若甲、乙两台抽水机单独工作,抽干池里的水,分别需()小时。A.30,15B.15,30 C.20,40 D.40,20 查看答案