题干
All the students are seated in the classroom, actually good at their study, listening attentively.
A：most of whom
B：most of who
C：most of them
D：most of which
答案(点此获取答案解析）
C
，由于甲看错了方程①中的a，得到方程组的解为；乙看错了方程②中的b，得到方程组的解为，试计算a2012+（b）2013的值．