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There are many boys_____(swim) in the river now.适当

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There are many boys_____(swim) in the river now.适当
适当形式填空.说说理由.谢谢!
There is one of my ______(dictinary) in his hand.
There are many boys_____(swim) in the river now.适当
swimming dictinaries
there be 结构用doing
one of译为.之一,说明是复数形式
再问: 可以说以下理由吗?
再答: 第一句已经有一个谓语are了,所以要填的是非谓语,男孩游泳是主动形式,所以填现在分词swimming
第二句因为是我其中的一本字典,说明是我所有字典里的其中一本,所有字典用的当然是复数