【单选题】【消耗次数:1】
He didn’t pass the final examination. He ______ it.
must have prepared for
ought to prepare
ought to have prepared for
ought to prepare to
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相关题目
【单选题】 They have done things they ought_____.
①  not to do
②  not to be done
③  not to have done
④  not having done
【多选题】 I _____________ that he will pass the examination.
①  have no doubt
②  am sure
③  have no idea
④  am sorry
【单选题】 He didn’t have the book ____________ I wanted.
①  what
②  \
【判断题】 A: Ought I to leave tomorrow? B: Yes, I think you ought to.
①  正确
②  错误
【单选题】 ____ he tried his best , he still failed the examination.
①  Although
②  Even although
③  However
④  Because
【单选题】 _______ he tried his best, he still failed the examination.
①  Although
②  Even although
③  However
④  Because
【单选题】 He was prepared to make the ultimate sacrifice, displaying ?bravery that was second to _________.
①  none
②  neither
③  anything
④  nothing
【单选题】 Jean did not have time to go to the concert last night because she was busy __________ for her examination.
①  to prepare
②  to be prepared
③  preparing
④  being prepared
【单选题】 —What’s the matter with the boys? —They didn’t pass the examination, but they still______.
①  hope that
②  hope it
③  hope to
④  hope so
【单选题】 Before the final examination, some students have shown _______ of tension. They even have trouble in sleeping.
①  anxiety
②  marks
③  remarks
④  signs
随机题目
【单选题】 交流伺服电动机的励磁绕组和控制绕组在空间相差_____度电角度。
①  30
②  60
③  90
【单选题】 改变直流电动机的转向方法有________。?
①  对调接电源的两根线
②  改变电源电压的极性
③  改变主磁通的方向或改变电枢中电流方向
【单选题】 交流伺服电机转子导体的电阻比普通笼式异步电机转子导体的电阻____。
① 
② 
③  相同
【单选题】 直流电动机电枢导体中的电流是_______。
①  直流电
②  交流电
③  脉动电流
【单选题】 直流电机换向极绕组与_________。?
①  电枢绕组并联
②  电枢绕组串联
③  并励绕组串联
【单选题】 下列励磁方式的直流电机不能空载运行的是___。
①  串励
②  并励
③  他励
【单选题】 直流电动机起动时必须在电枢回路中串联起动电阻,原因是刚起动时 ________。
①  主磁通较弱
②  反电动势为零
③  瞬间高压
【单选题】 下列调速法不适用于直流电机的是__。
①  在电枢回路的串联可调电阻
②  改变励磁回路中的励磁电阻
③  改变定子磁极对数
【判断题】 电容分相式单相异步电动机中,串接电容的那相绕组电流比另一绕组的电流滞后。
①  正确
②  错误
【判断题】 三相异步电动机处于电动机工作状态时,其转差率一定为sl。
①  正确
②  错误