It’s the test system rather than the teachers to blame for the students’ heavy burden nowa

It’s the test system rather than the teachers to blame for the students’ heavy burden nowadays.
A. who are
B. whom is
C. that is
D. that are

A. who areB. whom is(答案→)C. that isD. that are解析：试题分析:考查强调句型和主谓一致。分析结构可知此处是强调句型，被强调部分既有人也有物，所以用that，排除A、B选项；被强调部分the test system rather than the teachers在句中做主语，根据主谓一致的原则谓语动词应和the test system 一致，所以正确答案为C。

我检查一下我的答案