keep (sth) adj.意为保持（什么东西）怎样,怎样是个形容词.
A.是动词ing形式,v.ing形式,不能说窗户一直在打开.
B.open 既是动词,也是形容词,可以形容窗户是开着的.或者保持窗户开着的状态
C.opened只能作动词open的过去式.
D.没有keep sth to do的.这里的原意应该是保持怎样的状态.
We'd better keep the window _____.
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