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    --- It is weeks since he ___.
    ---So it is. We’d better ask some one else to help us.
    A．fell illB．was illC．is illD．has been ill
    A
    “他病了几周了。”since引导的从句使用一般过去时态。当since引导的从句中谓语动词是短暂性动词时，表示从动作开始到现在，因此答案A。
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