she couldnt understand was fewer and fewer students showed interestin her lessons.A. Wha

问题补充：

she couldn understand was fewer and fewer students showed interest

in her lessons.

A. What; why

B. That ; what

C. What ; because

D. What;which

答案：

(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。