she couldn't understand was fewer and fewer students showed interest
in her lessons.
A. What; why
B. That ; what
C. What ; because
D. What;which
网友回答
(答案→)A. What; why
B. That ; what
C. What ; because
D. What;which
解析：本题是主语从句和宾语从句的共同考查。what引导主语从句，同时充当understand的宾语。why引导定语从句。