【題目】_______ youcansleepwell,youwilllosetheabilitytofocus,planandstay motivatedafter one ortwonights.

A. Once B. Unless

C. If D. When

【答案】B

【解析】考查連詞詞義辨析及語境理解。句意：除非你能睡好，否則一兩個(gè)晚上之后，你會(huì)失去專注、計(jì)劃的能力和保持積極性。A. Once一旦；B. Unless除非；C. If如果；D. When當(dāng)……時(shí)候。故選B。

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