Bob often his homework after dinner.A. do B. does C. doing

问题补充：

Bob often his homework after dinner.

A. do B. does C. doing

答案：

解析：句意：晚饭后鲍勃经常做作业。do one’s homework做作业。根据副词often可知此处用一般现在时，主语是Bob,第三人称单数形式，故谓语用故选B。