【題目】_______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：除非你能睡個(gè)好覺(jué)，否則一兩個(gè)晚上后你就會(huì)失去集中注意力、計(jì)劃和保持活力的能力。

本題考查狀語(yǔ)從句。Once一旦，Unless除非，If如果，When當(dāng)……時(shí)候。結(jié)合句意，睡不好覺(jué)，你就會(huì)失去集中注意力的能力。故選B。

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