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All substances, _____ solids, liquids, or gases, are made up of entirely atoms.

A.whether they B.whether  C.whether are they D.whether are

B


解析:

在带有状语从句的复合句中,如果从句与主句的主语一致,且从句中含有be动词,则可以省略从句的主语及be动词。此处从句中省略了they are。

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