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I don't know about him, ____comment on him behind his back.
A.let alone
B.let go
C.leave alone
D.take leave
拓展
①let alone为“更别提”
➢We fear no death, let alone difficulties.
我们死都不怕,何况困难?
②let go为“放开”
➢let it go让它随风而去
③leave alone为“不管,不干涉”
➢Leave me alone.别管我。
④take leave 为“道别”
➢I'm afraid I must take leave now.
恐怕我现在得离开了。
解析
comment on/upon sth. /sb. 评论
本题答案:A翻译:我不认识他,更不用说在他背后对他评头论足了。