问题补充：
Itisknowntoallthateveryminute____fulluseof____thelessonswillbenefitstudentsagreatdeal．A.which makes； studyingB.when made； to studyC.that made； to studyD.which is made； studying
答案：
B解析这题考查状语从句的省略句（省略了主语+be动词）原句的正常顺序是： it is known to all that when ( it is ) made use of to study the lessons, every minute will benefit students a great.省略的it 指代的就是every minute因为主语一致，所以省略了主语和be动词。第二空的不定式是目的状语，译为：众所周知，如果每分钟都被充分地利用来学习课程的话，那将使学生受益匪浅。选B
