The education system rather than the teachers for the overburden on the students．
A. are to answer
B. is to answer
C. are answered
D. is answered
网友回答
A. are to answer
(答案→)B. is to answer
C. are answered
D. is answered
解析：考查主谓一致。rather than连接两个主语，谓语动词取决于前者，be to do 表示将来，一定做某事。所以选B 。