The boy didn’t go to school his illness(疾病)。A. becauseB. because ofC. ifD. but

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A. because
(答案→)B. because of
C. if
D. but
解析：B 考查because和because of的用法。because加句子，而because of加名词或名词短语。“那个男孩因为生病而没去上学”。