Our room must __clean.A.keepB.be keptC.to be kept D.to keep

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Our room must __clean.A.keepB.be keptC.to be kept D.to keep
Our room must __clean.
A.keep
B.be kept
C.to be kept
D.to keep

Our room must __clean.A.keepB.be keptC.to be kept D.to keep
B
must 后面是接动词的,所以A、B里面选
room保持干净是被动形式,所以选B咯