, water can be changed into gas. A. HeatedB. Being heated C. Having heatedD. Having been

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(答案→)A. Heated
B. Being heated
C. Having heated
D. Having been heated
解析：句子的主语是water，因此加热的动作是被动的；being heated是正在加热；having been heated是加热完之后；而heated没有时间概念，表示条件。