All gases and most liquid and solids expand _______ heated.A、inB、howC、whenD、a

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问题 All gases and most liquid and solids expand _______ heated.

选项 A、in
B、how
C、when
D、about

答案 C

解析 时间状语从句的缩略式。当状语从句(时间、条件、转折、方式等状语从句)的主语与主句的主语一致时,从句的主语可以省略,谓语使用非谓语动词形。例如:1.While waiting,I was reading some old magazines.2.Don’t speak until spoken to.3.The old lady was looking well although living alone.4.Whether true or false,the story is interesting.5.
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