—Do you spend a lot of time computer?—No but I spend much time doing my homework.A. on; i

问题补充：

—Do you spend a lot of time computer?

—No, but I spend much time doing my homework.

A. on; in

B. in; on

C. on; on

D. in; in

答案：

(答案→)A. on; in

B. in; on

C. on; on

D. in; in

解析：本题主要考虑spend的用法其结构为主语+spend money+in

Doing,或on sth，故选A