because her mum believes that is a good habit ——(learn)the knowledge
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because her mum believes that is a good habit ——(learn)the knowledge
to learn
a good habit to do sth
一个.的好习惯
不缺句子成分,所以可能缺定语,动词不定式做定语,to learn
他的速度提升员工需要多少土豆丝