Question

【题目】Betty is often seen ____ the old man with his housework.

A. help B. to help

C. helped D. helps

Answer 1

【答案】B

【解析】

试题句意：Betty经常被看到帮助那个老人做家务。see sb do sth,see后是加了一个省略了to的动词不定式。当用于被动结构是省略了的to还得加上，故选B。