求解答Betty is often seen( )the old man with his housework.这个题A.help_英语解答

求解答Betty is often seen( )the old man with his housework.这个题
A.help B.to help C.heiped D.helps
我知道这个题选B,但是不知道为什么,是不是跟被动语态有关系.那个to为什么要加上.
还有其它选项为什么不选.

人气：495 ℃　时间：2019-12-16 11:24:44

解答

Betty is often seen ( B.to help ) the old man with his housework.
贝蒂经常被见到帮那位老人做家务.
see sb do sth,看见某人做了某事.变为被动语态以后,原来的动词原形do之前要加上不定式的to,即be seen to do sth,被看见做了某事.所以这里是be seen to help.