题目内容
【题目】Betty is often seen ____ the old man with his housework.
A. help B. to help
C. helped D. helps
【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。
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题目内容
【题目】Betty is often seen ____ the old man with his housework.
A. help B. to help
C. helped D. helps
【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。