The speed limit for bicycles on campus is 15 mph, ___________ otherwise posted.
A．unlessB．untilC．sinceD．however
A

試題分析：句意：在校園內(nèi)自行車的限速是每小時15英里，除非另外說明。這里用unless“除非，如果不”，until“直到”，since“自從”，however“然而”，所以選A。
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