单选题 It is ______ understood by all concerned that the word no one who visits him ever breathe a syllable of in his hearing will remain forever unspoken.

【正确答案】 C
【答案解析】题意为：相关方面默然达成一致意见：拜访过他的人没有跟他讲的话以后也谁也不许说出去。tacitly沉默地，默然地；uncommunicatively不爱说话的；acceptably可以接受地；taciturnly(指人)沉默寡言地。