问题描述：
Dogs are our friends.They are often t() to do many things fo us.
Dogs are our friends.They are often t( ) to do many things fo us.
求t开头的单词满足上述句子的一个填空?
Dogs are our friends.They are often t( ) to do many things fo us.
求t开头的单词满足上述句子的一个填空?
问题解答：
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