选B.这是考察独立主格结构.
A的话,是不定式表将来.
B的话,是过去分词表示被动和完成.
因为加热后,液体会变成气态,所以用B,一般现在的时态就可以了.相当于：
When it is heated,liquids can be changed into gases.
_____,liquids can be changed into gases.A To be heated B Hea
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