________ she couldn't understand was ________ fewer and fewer students showed interest in her lessons.

1. A.
   What; why
2. B.
   That; what
3. C.
   What; because
4. D.
   Why; that

__________ 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

__________ she couldn't understand was__________ fewer and fewer students showed interest in her lessons.

A. What; why    B. That ; what    C. What ; because    D.

____ 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; why    B. That ; what    C. What ; because    D.What;what