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Our whole physical universe, when______to the simplest terms, is made up of two things, energy and matter.
A．being reduced
B．reducing
C．reduced
D．to be reduced

A.
A．being
B.reducing
C．reduced
D．to

【参考答案】

C
reduced是itisreduced的省略形式。状语从句由although，asif，if，nomatte......

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