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A lot of money was spent ____ the poor children in poor area

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A lot of money was spent ____ the poor children in poor areas
横线处:A helping.B to help.C helped
我知道答案是A,但为什么B不对?
A lot of money was spent ____ the poor children in poor area
spend 后的动词要用ING形式,不能接不定式.
首先要认清这是主动还是被动,这里钱做主语,是被动
如果是还原成主动句是:
we spent a lot of money helping the poor children in poor areas
被动就是:
a lot of money was spent helping the poor children in poor areas .
加油!不明白再问!
再问: 原来不能加不定式啊,帮了大忙了,谢谢!