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题目
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The Internet celebrated its birthday on September 2nd, by which time 40 years _______ since the first successful transfer of data between two computers.
A.has passedB.had passedC.passedD.have passed

答案
B
解析
考查时态,by which time引导定语从句,by+过去时间,谓语用过去完成时,句意是:互联网在九月二日庆祝了自己的生日,到这个时间时间为止自从两台计算机之间的第一个成功的通过的数据传输已经过去有40年了。选B。
核心考点
试题【The Internet celebrated its birthday on September 2nd, by which time 40 years __】;主要考察你对一般现在时等知识点的理解。[详细]
举一反三

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A.workedB.had workedC.are workingD.had been working

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——What do you think of Harry Potter and Philosopher’s Stone?
——Fantastic. Steven Kloves_______ each character in the movie impressive through lively dialogues and fascinating plots.
A.makesB.would make C.made D.had made

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A.is looking forB.has looked
C.has been looking forD.had looked

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A.had cookedB.cookedC.had been cookedD.were cooked

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A.is runningB.will be runningC.will have runD.has run

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