练习册

  • 练习册
  • 试题
    精英家教网 > 高中英语 > 题目详情
    Although the causes of cancer ________, we do not yet have any practical way to prevent it．
    A．have uncoveredB．have been uncovering
    C．are uncoveringD．are being uncovered
    D
    考查时态语态，句意是;虽然癌症的原因正在被揭示出来，我们还是没有实用的方法来阻止它，因为癌症是被揭示，用被动式，几个选项只有A是现在进行时的被动。选D。
    练习册系列答案
    年级 高中课程 年级 初中课程
    高一 高一免费课程推荐！ 初一 初一免费课程推荐！
    高二 高二免费课程推荐！ 初二 初二免费课程推荐！
    高三 高三免费课程推荐！ 初三 初三免费课程推荐！
    相关习题

    科目：高中英语 来源：不详 题型：单选题

    —why, James, you look so tired!
    ---Well, I _____the house and I must finish the work tomorrow.
    A．was paintingB．will be paintingC．have paintedD．have been painting

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：单选题

    If it was fresh and ________, then the ship was close to land.
    A．smelling strongB．smelled strongly
    C．smelled strongD．smelling strongly

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：单选题

    When he looked up, he suddenly found himself       by a group of teenagers,
          looked at him anxiously.
    A．to be surrounded; whichB．surrounded; who
    C．be surrounded; whoD．having been surrounded; which

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：单选题


    ——Is there any possible way to help them get rid of such a bad habit?
    ——To tell the truth, it’s very hard. But we_______ on this problem.
    A．workedB．had workedC．are workingD．had been working

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：单选题

    To      this happening again, John suggested that the source of all the water supplies      .
    A, stop, be examined                      B, keep, should be examined  
    C, prevent, examined                  D, stop, was examined

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：单选题

    —If he       , he      that food.
    —Luckily he was sent to the hospital immediately.
    A．was warned, would not takeB．had been ,warned, would not have taken
    C．would be warned, had not takenD．would have been warned, had not taken

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：单选题

    The manager had fallen asleep where he ______, without undressing．
    A．was layingB．was lyingC．had laidD．had lied

    查看答案和解析>>

    科目：高中英语 来源：不详 题型：单选题

    Had I mastered the statistic technique, a large amount of time and, energy      .
    A．was avidB．had been savedC．will be savedD．would have been saved

    查看答案和解析>>

    同步练习册答案