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    【题目】_______you can sleep well, you will lose the ability to concentrate, plan and stay active after one or two nights.

    A.OnceB.UnlessC.IfD.When

    【答案】B

    【解析】

    句意：除非你能睡个好觉，否则一两个晚上后你就会失去集中注意力、计划和保持活力的能力。

    本题考查状语从句。Once一旦，Unless除非，If如果，When当……时候。结合句意，睡不好觉，你就会失去集中注意力的能力。故选B。

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