The speed limit for bicycles on campus is 15 mph, otherwise posted.A. unless????????? B. until????? ????????????? ? C. since??????????? D. however 题目和参考答案——青夏教育精英家教网—

题目内容

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

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

【答案】

【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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