因为题中提示词为 now,表示雨一直下到“现在”.而现在完成进行时比现完的更加强调两点,一点就是,动作一直持续到“现在”,即说话时（或最近一段时间）；第二是,强调动作有持续下去的趋势.
7.It _______ for two hours now.
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