【题目】What can we do ________the water clean? （ ）
A.keepB.to keepC.keeping
【答案】B
【解析】
略
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What can we do the water clean? ( )A.keepB.to keepC.keeping
编辑：chaxungu时间：2026-04-28 12:02:59分类：小学英语题库
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