2. 外语
  3. All gases and most liquids and solids expand when ______ .

All gases and most liquids and solids expand when ______ .

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问题 All gases and most liquids and solids expand when ______ .
选项 A、heated
B、heating
C、being heating
D、heat
答案A
解析 非谓语动词题。在时间、条件、让步等状语从句中，当从句主语和主句主语一致时，可将从句的主语和be的变化形式省略，本句的完整形式为"All gases and most liquids and solids expand when they are heated."省略they are，故选A
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