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设 $A, B$ 为随机事件, 若 $0 < P(A) < 1,0 < P(B) < 1$ ,则 $P(A \mid B)>P(A \mid \bar{B})$ 的充分必要条件是
A. $P(B \mid A)>P(B \mid \bar{A})$     B. $P(B \mid A) < P(B \mid \bar{A})$     C. $P(\bar{B} \mid A)>P(B \mid \bar{A})$     D. $P(\bar{B} \mid A) < P(B \mid \bar{A})$         
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