题目

题型：不详难度：来源：

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

A．whether they

B．whether

C．whether are they

D．whether are

答案

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。