2. 外语
  3. All substances, ________ , liquid or solid, are made up of atoms.

All substances, ________ , liquid or solid, are made up of atoms.

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问题 All substances, ________ , liquid or solid, are made up of atoms.
选项 A、be they gases
B、whether they are gases
C、they are gases
D、they can be gases
答案A
解析 在以whether引导的虚拟让步状语从句中，其谓语往往用原形动词，而当whether省略时，主谓需倒装。因此本题可用A项，或使用whether they be表达。
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