It takes him two hours a day to do his homework.（同义句）
He (does) his homework (for) two hours a day.
他一天要做两个小时的作业.��for��֪�����ǵġ�for��һ��ʱ�䣬��ʾҪ����á������Ŀ��He ___two hours ___ his homework a day. �Dz�����spends��doing��