【单选题】【消耗次数:1】
Now Mike isn’t here. He _______ Mr. Green’s. Perhaps he _______back in a few minutes.
went to ; is coming
has gone to ; will come
has been to ; will be
is going to ; has come
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【单选题】 Now Mike isn’t here. He ________ Mr. Green’s. Perhaps he ________ back in a few minutes.
①  went to ; is coming
②  has gone to ; will come
③  has been to ; will be
④  is going to ; has come
【单选题】 10.Now Mike isn’t here. He _________ Mr. Green’s. Perhaps he _______ back in a few minutes.
①  went to; is coming
②  has gone to; will come
③  has been to ; will be
④  is going to; has come
【单选题】 There has been an atmosphere of ( ) around here for a few days now.
①  anticipation
②  greeting
③  knowledgw
④  knowing
【单选题】 He has been there, [填空]?
①  hasnt he
②  has he
③  does he
④  doesnt he
【单选题】 He used to in a small village, but now he has been used to in the big city.
①  live, living
②  live, live
③  living, living
④  living, live.
【单选题】 He has been writing the essay the whole morning and he still ___ .
①  has been
②  does
③  has
④  is
【单选题】 He has been writing the essay the whole morning and he still ___ .
①  has been
②  does
③  has
④  is
【单选题】 Mr. John was busy, ____ he could not come.
①  but
②  therefore
③  and
④  nor
【单选题】 Mr Longman has played the cello for many years [] but he now conducts an orchestra.
①  comma
②  semicolon
【判断题】 He has been in china for three years.
①  正确
②  错误
随机题目
【单选题】 特权指令____执行。()
①  只能在目态下
②  只能在管态下
③  可在管态也可在目态下
④  从目态变为管态时
【单选题】 对资源采用静态分配策略能()
①  防止死锁
②  避免死锁
③  检测死锁
④  解除死锁
【单选题】 有n个进程并发执行时,系统允许每次最多m个进程(1≤mn)同时使用某资源。若使用PV操作来管理,则信号量的变化范围是()
①  [(m-n),m]
②  [(m-n),n]
③  [(n-m),m]
④  [(n-m),n]
【单选题】 把空闲区按地址顺序从小到大登记到空闲区表中,分配时顺序查找空闲区表,找到第一个能满足作业长度要求的空闲区,一部分分配给作业,另一部分仍为空闲区。这样的算法是()
①  先进先出分配算法
②  最先适应分配算法
③  最优适应分配算法
④  最坏适应分配算法
【单选题】 在页式虚存系统中,把以后不再访问的或距当前最长时间后再访问的那一页调出的页面调度算法是()
①  最佳调度算法(OPT)\
②  最近最久未使用调度算法(LRU)
③  最近最不经常使用调度算法(LFU)
④  先进先出调度算法(FIFO)
【单选题】 在下列选项中,不属于造成某进程状态从等待态__________就绪态变化的原因是()
①  有更高优先级的进程要运行
②  该进程占用的外围设备工作结束
③  该进程等待的资源得到满足
④  该进程等待干预的故障被排除
【单选题】 在页式虚拟存储管理中,当发现要访问的页面不在主存时,则由硬件发出()
①  输入输出中断
②  时钟中断
③  越界中断
④  缺页中断
【单选题】 采用抢夺式分配资源的策略可以防止死锁,恰当的抢夺方法是()
①  需要时可抢夺打印机
②  任何时刻均可抢夺主存资源
③  高优先级的进程可抢夺处理器
④  共享资源均可被抢夺
【单选题】 具有微型化和实时性特点的操作系统是()
①  单用户微机操作系统
②  实时操作系统
③  单道批处理操作系统
④  嵌入式操作系统
【单选题】 当硬件的中断装置发现有中断事件发生时,就会中断原来程序的执行,然后在CPU上执行的是操作系统的()
①  系统调用程序
②  中断处理服务程序
③  系统核心程序
④  系统引导程序