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She was seen_____paper planes in the room.A.to make B.making

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She was seen_____paper planes in the room.A.to make B.making 为什么选A呢?B也可以啊.
She was seen_____paper planes in the room.A.to make B.making
感官动词或使役动词使用省略to的动词不定式,主动语态中不带to ,但变为被动语态时,须加上to .make somebody do something → somebody+ be +made to do something
  see somebody do something → somebody +be +seen to do something