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    精英家教网 > 高中英语 > 题目详情
    Recently some studies have found that learning ____________ second language can lead to _______________ increase in one’s brain power.
    A．a; theB．不填; theC．a; anD．the; an
    C
    a +序数词表示再一，又一；an increase 一种增加，用做名词这个时候看作可数。
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