Question

My son ______spend all his pocket money, but now he ______saving some of it.

1. A.
   was used to…used to
2. B.
   used to…is used to
3. C.
   used to…used to
4. D.
   was used to…is used to

Answer 1

B
根据but now可知前文应为过去时态，used to可表示曾经做某事，be used to doing sth 习惯了做某事，故选B。