We must keep our country_______. A.cleaning B.clean C.to clean D.cleaned

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We must keep our country_______. A.cleaning B.clean C.to clean D.cleaned

We must keep our country_______. A.cleaning B.clean C.to clean D.cleaned
We must keep our country_______. A.cleaning B.clean C.to clean D.cleaned

We must keep our country_______. A.cleaning B.clean C.to clean D.cleaned
答案选B.clean
keep sth clean 保持.干净,它是个固定的结构.

B

B
keep +宾语+形容词, 固定用法 :保持某物处于某个状态

B