【单选题】【消耗次数:1】
15.The book was so interesting that he had read it for three hours ______ he realized it.
when
until
after
before
参考答案:
复制
纠错
相关题目
【单选题】 It was not until he arrived in class _____ realized he had forgotten his book.
①  when he
②  that he
③  and he
④  he
【判断题】 Before he began to study in the university, he had worked in a company for three years.
①  正确
②  错误
【单选题】 After failing the exams three times, Jack realized that he’d never ____in English.
①  see to it
②  attain it
③  catch it
④  make it
【单选题】 The letters for the boss __________ on his desk but he didnt read them until three days later.
①  were put
②  was put
③  put
④  has put
【单选题】 He has left his book here on___, so that you can read it.
①  purpose
②  intention
③  aim
④  meaning
【单选题】 Before?he came to China, he??[填空]Chinese for three years.
①  have learned
②  had learned
③  learned
④  learning
【单选题】 20. Only when he had handed in his exam paper ____ he had made several mistakes.
①  he has realized
②  does he realize
③  has he realized
④  did he realize
【单选题】 He looked at the little girl, _________ where he had seen her before.
①  wondering
②  wondered
【单选题】 Before he came to New York, he had never heard a single English word().
①  speak
②  to speak
③  spoke
④  spoken
【单选题】 His mother had talked to him for two hours while he was watching TV, but_____.
①  a little did he hear
②  little did he hear
③  little heard he
④  a little heard he
随机题目
【判断题】 当刃倾角λ<0时,切屑向工件的待加工表面方向流出。()
①  正确
②  错误
【判断题】 工序能力系数与被加工工件工序公差无关。()
①  正确
②  错误
【单选题】 高速钢刀具的主要磨损形式是()。
①  扩散磨损
②  粘结磨损
③  氧化磨损
④  机械磨损
【判断题】 工件材料的塑性越大,材料的切削加工性就越好。()
①  正确
②  错误
【判断题】 车削时为获得高的表面质量应采用中速切削。()
①  正确
②  错误
【判断题】 滚齿时,轴向进给传动链是内联系传动链。()
①  正确
②  错误
【单选题】 在C6140机床传动系统中,主轴属于()。
①  执行件
②  运动源
③  传动装置
④  传动件
【判断题】 当进给速度较大时,一般需要计算刀具的工作角度。()
①  正确
②  错误
【单选题】 设连续型随机变量的密度函数为,则当()时,为随机变量数学期望.
①  收敛
②  为有界函数
③ 
④  绝对收敛
【单选题】 为任意两事件,若之积为不可能事件,则称与()
①  相互独立
②  互不相容
③  互为独立事件
④  为样本空间的一个部分