she couldn’t understand was more and more students showed little interest in their lessons.
A. What; why
B. That; what
C. What; because
D. Why; that
网友回答
(答案→)A. What; why
B. That; what
C. What; because
D. Why; that
解析：考查名词性从句。What引导起主语从句what she couldn’t understand，在句中understand的宾语。Why more and more students showed little interest in their lessons是 一个表语从句。因为句子很完整，所以使用连接副词why引导。句意：她不能理解的是为什么越来越多的学生对他们的课程没有兴趣。