2. 外语
  3. Our whole physical universe, when______to the simplest terms, is made up of two things, energy and matter.

Our whole physical universe, when______to the simplest terms, is made up of two things, energy and matter.

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问题 Our whole physical universe, when______to the simplest terms, is made up of two things, energy and matter.
选项 A、being reduced
B、reducing
C、reduced
D、to be reduced
答案C
解析 reduced是it is reduced的省略形式。状语从句由although，as if，if，no matter+wh一，once，though，unless，until，when，where，whether，while等连词引导，表示时间、地点、条件、让步和方式，可省略主语和助动词be，保留一ing分词、一ed分词或表语。这样省略的条件是：(1)从句中被省略的主语必须与主句的主语一致；(2)谓语动词必须含有be；(3)从句必须主语和be动词一起省去，不可只省略主语而保留整个谓语，也不可只保留主语而省略谓语。本句译为：物质世界，如果用最简单的话来说，是由两样东西组成的，即能和物质。
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