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。
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