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题目
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In the past twelve months the research members ______ the effectiveness of many materials in a home building.
A.had studiedB.would studyC.studiedD.have studied

答案
D
解析
考查时态。根据时间状语in the past twelve months在过去的12个月,用现在完成时,故选D。
核心考点
试题【In the past twelve months the research members ______ the effectiveness of many 】;主要考察你对一般现在时等知识点的理解。[详细]
举一反三
By the time you arrive in Liverpool, we ___________ in France for two weeks.
A.shall stayB.have stayedC.will have stayedD.have been staying

题型:不详难度:| 查看答案
By the time he was twelve, Edison ________ to make a living by himself .
A.would beginB.has begunC.had begunD.was begun

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—You seem tired, David.
—Yes. I _____ all day long and can’t wait to go to bed now.
A.am workingB.had been working
C.have been working D.was working

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The main road _____ for repairs, so we had to change the route to the downtown.
A.is being closedB.has been closedC.was to be closedD.had been closed

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— Do you agree that lions and tigers ______ the cat family?
— I have no idea.
A.belongB.are belonged toC.are belonging toD.belong to

题型:不详难度:| 查看答案
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