【单选题】【消耗次数:1】
I’m ill. I_______working very hard.
have
have been
had
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相关题目
【单选题】 I’m very sorry to have ____ you with so many questions on such an occasion.
①  interfered
②  offended
③  impressed
④  bothered
【单选题】 How stupid I have been! Why _______ I do that before?
①  don’t
②  didn’t
③  not
【单选题】 I hope ___ the little ___ I have been able to do has been of some use.
①  that; that
②  /; by which?
③  what; what
④  /; with which
【单选题】 12. I’m very sorry to have _______ you with so many questions on such an occasion.
①  interfered
②  offended
③  impressed
④  bothered
【单选题】 I have been at home [填空]Sunday.
①  on
②  for
③  at
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【单选题】 They are working hard to____ what they have lost.
①  make out for
②  keep up with
③  catch up with
④  make up for
【单选题】 If I had remembered __________ the window, the thief would not have got in.
①  to close
②  closing
③  to have closed
④  having closed
【单选题】 The reason I didn’t go to school that day was ____ill.
①  due to
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③  because of falling
④  because I fell
【单选题】 I often ______ the cooking for my family, but recently I have been too busy to do it.
①  will do
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①  what
②  which
③  that
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随机题目
【单选题】 排序算法中,从尚未排序序列中依次取出元素与已排序序列(初始为空)中的元素进行比较(要求比较次数尽量少),然后将其放入已排序序列的正确位置的方法是( )。
①  A.折半插入排序
②  B.直接插入排序
③  C.归并排序
④  D.选择排序
【单选题】 采用顺序查找方法查找长度为n的线性表时,每个元素的平均查找长度为( )。
①  A.n
②  B.n/2
③  C.(n+1)/2
④  D.(n-1)/2
【单选题】 若待排序序列在排序前已按关键字递增排列,则采用( )方法比较次数最多。
①  A.直接插入排序
②  B.归并排序
③  C.归并排序
④  D.直接选择排序
【单选题】 一组记录的关键字序列为(32,65,42,24,26,80),利用快速排序,以第一个关键字为分割元素,经过一次划分后结果为( )。
①  A.26,24,32,42,65,80
②  B.24,26,32,42,65,80
③  C.26,24,32,65,42,80
④  D.26,24,32,80,42,65
【单选题】 如果要求一个线性表既能较快地查找,又能动态适应变化要求,可以采用( )查找方法。
①  A.顺序
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【单选题】 有一个长度为11的有序表,按折半查找对该表进行查找,在等概率情况下查找成功的平均比较次数为( )。
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②  B.33/11
③  C.26/11
④  D.30/11
【单选题】 线性表以( )方式存储,能进行折半查找。
①  A.关键字有序的
②  B.关键字有序的顺序
③  C.链接
④  D.顺序
【单选题】 一组记录的关键字序列为(22,55,32,14,16,60),利用快速排序,以第一个关键字为分割元素,经过一次划分后结果为( )。
①  A.16,14,22,55,32,60
②  B.16,14,22,32,55,60
③  C.16,14,22,60,32,55
④  D.14,16,22,32,55,60
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①  A.32,37,40,42,62,92
②  B.37,32,40,42,62,92
③  C.32,40,37,42,62,92
④  D.32,37,42,40,62,92
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①  A.插入排序
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