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题目
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For a long time, he hesitated whether he should tell us ____ what had happened.
A.at duskB.at lengthC.at presentD.at stake

答案
B
解析
词义辨析题。A.at dusk 在黄昏时刻       B.at length  详尽地C.at present目前    D.at stake 在危急关头 根据句意:他犹豫了好长时间是否要详尽的告知我们所发生的事情。选B
核心考点
试题【For a long time, he hesitated whether he should tell us ____ what had happened.A】;主要考察你对介词和介词短语等知识点的理解。[详细]
举一反三
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A.onB.atC.withD.by

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A.downB.outC.upD.in

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people have always been curious ______ how living things on the earth exactly began.
A.inB.atC.ofD.about

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He hurried to the airport and got _______ the plane just in time.
A.on board B.in board C.on the board D.in the board

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He’s ____ working in Germany as a representative of a Chinese company.
A.at onceB.at a timeC.at presentD.on time

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