例:I haven't met that professor prior to today.(以前我从未见过那位教授。) 4. 现在完成进行时(have been doing) 用法:表示某一动作开始于过去某一时间,延续或重复地出现至今,或将继续延续至将来。 例:We have been working on this project for over a month now...
文章开篇提出主题,关于“the ability to focus without distraction”, 第二段开头说“a number of approaches”, 提出方法,第四段开头another approach,所以这篇文章重点还是在说方法,所以B选项approaches to getting more done in less time为正确答案。more done i...
A.havingbeenaddressedB.tohaveaddressed C.tohavebeenaddressedD.beingaddressed 12.TheSpaceShuttleColumbiabrokeintopiecesoverTexasasitreturnedtotheearthonFebruary1,2003, ___allsevenastronautsaboard. A.havingkilledB.killingC.beingkilledD.killed 13.Ther...
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