____ she couldn’t understand was ____ fewer and fewer students showed interest in her lessons.
A．What; because B．That; what
C．What; why D．Why; that k+s-5#u
____ she couldn’t understand was ____ fewer and fewer students showed interest in her lessons.
A．What; because B．That; what
C．What; why D．Why; that k+s-5#u
C
本题考查主语从句和表语从句。第一空作understand的宾语，所以用what。
why与because都可引导表语从句，但why从句说明结果，because从句说明原因。