题目

Mark was a student at this university from 1999 to 2003, _______ he studied very hard and was made Chairman of the Students Union. A. during which time B. for which time C. during whose time D. by that time 答案：A 解析: 此题考查非限制性定语从句。首先排除D项，因为它构不成定语从句；was made chairman为短暂动作，不能加for引导的一段时间，因此，排除B项；C项关系代词“whose” 应用错误，1999 to 2003并不为Mark独有。故应选择A项。全句意为:马克从1999年到2003年在上大学，在这几年期间他学习刻苦，被选为学生长江干流水能丰富的河段是(    )A．源头附近 B．宜宾到宜昌C．宜昌到城陵矶D．自源头到宜宾