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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
B
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
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