We must ______ on water during the dry season.

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问题 We must ______ on water during the dry season.

选项 A、economical
B、economize
C、economy
D、economically

答案B

解析 economize是动词，economical是形容词，economically是副词，economy是名词，而此题缺少谓语动词，所以选B．economize on(节约，节省)。

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