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—What is the boy doing?
—It's not necessary for you to be ________ about others' business.
A．connectedB．combined
C．contributedD．concerned
D
D　　[be concerned about ...為固定搭配，表示“關(guān)心……”。connect和combine意為“聯(lián)系，結(jié)合”；contribute“貢獻(xiàn)”。]
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