Only those who have experienced hardship     well aware of what happiness means.

    A．can they be    B．they can be    C．can be         D．they can

Only those who have experienced hardship     well aware of what happiness means.

    A．can they be  B．they can be  C．can be   D．they can

30. Only those who have experienced hardship ____ well aware of what happiness means. 

Only those who have experienced hardship ________ well aware of what happiness means．

1. A.
   can they be
2. B.
   they can be
3. C.
   can be
4. D.
   they can

Only those who have experienced hardship _______ well aware of what happiness means．

A．can they be             B．they can be      C．can be                D．they can