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The speed limit for bicycles on campus i...

The speed limit for bicycles on campus is 15 mph, ___________ otherwise posted.

A. unless          B. until                      C. since            D. however

 

A 【解析】 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。 考点:考查连词  
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