选B.
is cleaned没有疑问了吧?关键是第二个空.
keep用来表示“被保持”的时候,虽然是被动语态,但是看作系动词（省略be动词,用动词原形）.形式为：keep+adj/adv/prep phrase.
可参见：
一道有关被动语态的英语选择题~Our classroom-____everyday and ____clean and
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