第12题: [单项选择]All substances, ______, liquid or solid, are made up of atoms. A. be they gases B. whether they are gases C. they are gases D. they can be gases 参考答案:A 答案解析:[考点] 考查虚拟语气。 在whether引导的虚拟让步状语从句中,谓语往往用原形动词,而省略whether时,主谓需倒装。因此本题选A,但whether they be的表达也正确。