we should Keep our classroom ---A.cleaned B.clean C.cleaning D.to clean说说原因

we should Keep our classroom ---A.cleaned B.clean C.cleaning D.to clean说说原因

题目
we should Keep our classroom ---A.cleaned B.clean C.cleaning D.to clean说说原因
答案
we should Keep our classroom ---A.cleaned B.clean C.cleaning D.to clean
选 B.
keep sth clean 保持.干净, 它是个固定的结构.
keep the classroom clean and tidy
keep your hands dry
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