His father’s work is interesting but dangerous.A. a kind ofB. kindC. a kindD. kind of

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A. a kind of
B. kind
C. a kind
(答案→)D. kind of
解析：此题考查kind of和a kind of的区别，前者表示一点，后者表示一种，句意：他父亲的工作令人感兴趣但是有点危险。所以选D。