Compared with male graduates, a small number of female graduates can get employed when t

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A. casually
(答案→)B. relatively
C. roughly
D. gradually
解析：B 考察副词辨析。Casually随便的，偶尔地；relatively相对地；roughly粗糙的；gradually逐渐的；句意：与男性毕业生相比，在找工作的时候较少的女性毕业生能够找到工作。根据句意说明B正确。