Sam spends two hours his homework every day.A. to do B. doing C. do

问题补充：

Sam spends two hours his homework every day.

A. to do B. doing C. do

答案：

解析：spend用于sb spend...on sth或者sb spend...in doing sth（in可以省略），spend的主语必须是人，可以指花费时间、也可以指花费金钱；句意：萨姆每天花费两个小时做作业。结合语境可知选B。