Betty is often seen ( )the old man with his housework...

Betty is often seen ( )the old man with his housework...

题目
Betty is often seen ( )the old man with his housework...
A.help B.to help C.helped D.helps 选哪个
说明原因
答案
B
sb be seen do sth.表示经常被看到做某事,这里有often,所以用help 句子的意思是 Betty经常被看到帮助那位老人做家务.
如果是被看到正在做某事,就要用sb be seen doing sth.
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