再问一个语法

Hank_exeUID: 2519379

Writing about people whose circumstances were deplorable, Dikens used the novel to protest social conditions in Victorian England.
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Grandma, affectionately called ‘Grandma’, encourage her grandson’s reading by assuring him that the words he hesitated on are the same ones she would have stumbled upon.
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书上说第二句话必须用hesitated on 那为什么第一句话不用protest against 而只要protest就好了呢？

AdamasUID: 2127982

第二句是定语从句，He hesitated on the words