2. 外语
  3. All gases and most liquid and solids expand _______ heated.

All gases and most liquid and solids expand _______ heated.

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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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