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    精英家教网 > 高中英语 > 题目详情
    The speed limit for bicycles on campus is 15 mph, ___________ otherwise posted.
    A．unlessB．untilC．sinceD．however
    A

    试题分析：句意：在校园内自行车的限速是每小时15英里，除非另外说明。这里用unless“除非，如果不”，until“直到”，since“自从”，however“然而”，所以选A。
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