Almost all gases, liquids and solids expand heated. [ ] A．whenB．how C．inD．by 题目和参考答案——青夏教育精英家教网—

题目内容

Almost all gases, liquids and solids expand ________ heated.

[　　]

A．when

B．how

C．in

D．by

答案：A
提示：

“when＋过去分词”意为“当被…时”，题中when heated等于when they are heated。

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