Last year, I usually spent a lot of time my homework. And at the same time, I paid some money my musical classes.
A. to do, for
B. doing, for
C. and do, on
D. with doing, on
网友回答
A. to do, for
(答案→)B. doing, for
C. and do, on
D. with doing, on
解析：spend +时间+doing sth或on sth，而pay ···for，表示为··付账。故选答案为B