单项选择The earth is our house.We must _____ the land,air and water clean.A .change B.let C.stay D.keep

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单项选择
The earth is our house.We must _____ the land,air and water clean.
A .change B.let C.stay D.keep

keep 当意思为保持环境卫生整洁时 用 keep
keep clean是常用的词组

D

keep

keep