My son spend all his pocket money, but now he saving some of it.
A. was used to…used to
B. used to…is used to
C. used to…used to
D. was used to…is used to
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A. was used to…used to
(答案→)B. used to…is used to
C. used to…used to
D. was used to…is used to
解析：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。