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C knows the answer by deducing D is not yelling out the answer.
! O# s4 G3 D' r2 E) x( e. B! t5.39.217.77:8898That means D is not sure the answer by seeing one white and one black.
$ m# i2 `8 s) O' U8 NTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。C saw B is wearing the white, hence he is wearing the black