【单选题】【消耗次数:1】
______hewasoutoftheroom,heturnedbackandknockedattheteachersdooragain.
Before
Since
Assoonas
Until
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相关题目
【单选题】 Agreatnumberofcollegesandfactories____since1949.
①  hasbeenestablish
②  havebeenestablished
③  haveestablished
④  hadbeenestablished
【单选题】 Since the road is wet this morning, ____ last night. ?
①  it must have rained ?
②  ?it must rain ?
③  it must be raining ?
④  it must have been rained?
【单选题】 A lot of students ____ the campus since July 1.
①  have left
②  leave
③  left
④  is leaving
【单选题】 Since the matter was extremely _____, we dealt with it immediately.
①  tough
②  tense
③  urgent
④  instant
【单选题】 I ________ here since I moved here.
①  will work
②  worked
③  work
④  have been working
【单选题】 They can’t leave until they _________ their work .
①  did
②  are doing
③  have done
④  his done
【单选题】 They can’t leave until they _______ their work .
①  did
②  are doing
③  have done
④  his done
【单选题】 36.It was not until 1920 _____regular radio broadcasts began.
①  while
②  which
③  that
④  since
【单选题】 Chinahas launched a number of ____satellites since the 1970s.
①  information
②  Communication
③  TV
④  message
【单选题】 His mother _____alone since his father died.
①  lived
②  lives
③  has lived
④  is living
随机题目
【判断题】 对于一个完全竞争厂商来说,其边际收益与市场价格是相同的。
①  正确
②  错误
【判断题】 完全竞争厂商面对的需求曲线由市场价格所决定,故其完全缺乏弹性。
①  正确
②  错误
【判断题】 由于完全竞争厂商的需求曲线是平行的,所以其边际成本曲线也必然是平行的。
①  正确
②  错误
【判断题】 完全竞争行业是竞争最激烈的行业。
①  正确
②  错误
【判断题】 完全竞争市场的参与者只能接受价格,而不能影响价格
①  正确
②  错误
【单选题】 一般地,若厂商的价格低于( )时它将停止营业。
①  平均成本;
②  平均可变成本;
③  平均固定成本;
④  边际成本。
【单选题】 在厂商的停止营业点处,有
①  P=AVC;
②  TR=TVC;
③  总亏损等于TVC;
④  以上都对。
【单选题】 完全竞争厂商处于MC=AC=AR时,则它
①  必然得到最大利润;
②  是否得到最大利润尚不能确定;
③  只得到正常利润;
④  肯定得到最小利润。
【单选题】 在某一产量水平上, 厂商的平均成本达到了最小值, 则
①  厂商的经济利润为零;
②  厂商获得了最小利润;
③  厂商获得了最大利润;
④  边际成本等于平均成本。
【单选题】 下列哪一个行业最接近完全竞争行业。
①  飞机行业;
②  服装行业 ;
③  香烟行业;
④  玉米行业。