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

A. help B. to help

C. helped D. helps

【答案】B

【解析】

試題句意：Betty經(jīng)常被看到幫助那個老人做家務(wù)。see sb do sth,see后是加了一個省略了to的動詞不定式。當(dāng)用于被動結(jié)構(gòu)是省略了的to還得加上，故選B。

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