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It's not necessary for you to be ________ about others' business.

[  ]

A.concern

B.concern yourself

C.concerning

D.concerned

答案:D
解析:

“be concerned about…”为固定搭配,表示“关心……”。B项有较大干扰性,但此空前有be动词,若无be动词,则B项正确。


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