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    -The window is dirty.
    -I know. It ___________ for weeks.

    A．hasn’t cleaned B．didn’t clean C．wasn’t cleaned D．hasn’t been cleaned

    D

    解析试题分析：句意：--窗户很脏。---我知道。它有数周没被清洁了。这里强调没有被清洗已经持续了几周，可能还要进行下去，符合现在完成进行时的用法，而且the windows和clean是被动关系，选D。
    考点：考查时态语态

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