Things have changed quickly over the past decade and life in the country is much better than      used to be．

Things have changed quickly over the past decade and life in the country is much better than ___used to be．

A．that???????????????????? ????????????? B．what

C．it?????????????????? ????????????? D．one

Things have changed quickly over the past decade and life in the country is much better than      used to be．

A．that              B．it                C．what             D．one

Things have changed quickly over the past decade and life in the country is much better than      used to be．

1. A.
   that
2. B.
   it
3. C.
   what
4. D.
   one