________ some teenagers don’t realize is ________ difficult life can be after they get addicted to drugs.

A. What; how     B. That; how     C. What; what a      D. That; what

______ some teenagers don’t realize is _______ difficult life can be after they get addicted to drugs．

       A．What, how             B．That, how            C．What, what a   D．That, what

_____ some teenagers don’t realize is ____ difficult life can be after they get addicted to drugs.

   A. What; how   B. That; how    C. That; what   D. What ; what a

________ some teenagers don’t realize is ________ difficult life can be after they get

addicted to drugs.

A. That, how        B. That, what      

C. What, what a    D. What, how

______ some teenagers don’t realize is _______ difficult life can be after they get addicted to drugs．

1. A.
   What, how
2. B.
   That, how
3. C.
   What, what a
4. D.
   That, what