填空题 Although Professor Green's lectures usually ran {{U}}over{{/U}} the {{U}}fifty-minute{{/U}} period, {{U}}but none{{/U}} of his students {{U}}ever{{/U}} objected as they found his lectures both informative and interesting. A. over B. fifty- minute C. but none D. ever
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【正确答案】 1、C, 去掉but    
【答案解析】[试题分析] 本题测试连接手段。 [详细解答] 在英语句法中，只要有了though或although就不能再有but，反之亦然。本句前面已有了although，后面就应去掉but。