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Are you sure all the windows ____?

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Are you sure all the windows ____?
A close B closed C have closed D have been closed
选什么?为什么?
Are you sure all the windows ____?
后面要用一个句子,因此要用DAre you sure all the windows (have been closed).或者Are you sure all the windows are closed?你确定所有窗户都关好了吗?窗户要被关,因此只能用被动的,这里只有D是被动语态,其它都不...