When Edith saw so many students ______in front of her ,her h

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When Edith saw so many students ______in front of her ,her heart could not help ___fast.
A.seated;beating B.sit ;beaten C.seating;beating D.sitting;beat

could not help 是固定短语,意思是禁不住,后面只能加动词的ing形式.这样就剩A和C了,seat作为动词时,意思是“使（某人）就座”,为及物动词,其结构为seat sb.
此短语倒过来即为sb be seated.
再问： see后面不是跟doing或do吗
再答：英语有一个就近原则，首先先看跟这个动词最近的主语与动词之间的关系，而seat 的用法为sb be seated

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