It is the educational system, rather than the teachers, is to blame for the students’ heavy burden nowadays.
A. who
B. this
C. that
D. whom
网友回答
A. who
B. this
(答案→)C. that
D. whom
解析：考察强调句型。强调句型的基本结构：it is/was被强调成分who/that其它成分；强调句型的最大特点是把it is/was…that/who去掉，句子仍然成立。