Last year I usually spent a lot of time my homework. And at the same time I paid some mo

问题补充：

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

答案：

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