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to improve oueselves,we shall learn all the subjects_____we

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to improve oueselves,we shall learn all the subjects_____we can
Aso hard as Bas hard as Cso hardly as Das hardly as
选B
首先排除C和D,因为hard本身就是副词形式,不用加-ly.
as...as可以用在肯定句中,表示“像...一样”,后面的形容词或者副词要用原级.在否定句中,as...as和so...as都可以用.而在肯定句中只能用as...as.
故选B