All gases and most liquids and solids expand when ______ .A、heatedB、heatingC、b

游客2024-10-21 14

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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