my dear teacher couldn’t understand was fewer and fewer middle school students showed int

问题补充：

my dear teacher couldn’t understand was fewer and fewer middle school students showed interest in her lessons.

A. What; why

B. That; what

C. What; because

D. Why; that

答案：

(答案→)A. What; why

B. That; what

C. What; because

D. Why; that

解析：本题考查名词性从句。was前为主语从句，从句动词understand缺少宾语，故用what；was后为表语从句，why在从句中作原因状语。故选A。