北京市房山区2015高考英语完形填空基础练习（8）及答案解析
完形填空-----议论文
(2009•江苏)The requirements for high school graduation have just changed in my community.As a result，all students must __61__sixty hours of service learning，__62__ they will not receive a diploma.Service learning is academic learning that also helps the community.__63__ of s
