His illness his absence.A. showedB. accounts forC. explainsD. gives out

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A. showed
(答案→)B. accounts for
C. explains
D. gives out
解析：短语辨析。     A. 显示，表现 B.说明……的原因 C. 解释，说明 D.公布，发表。句意：他的病情说明了他缺席的原因。故选B。