Though we don't know what was discussed, yet we can feel the topic ________.
A.had changed
B.will change
C.was changed
D.has been changed
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D解析考查动词时态和语态。所填动词在参照时间feel之前已经完成，而feel是一般现在时，故此处用现在完成时，主语topic与change之间是被动关系，用被动语态，故选D。A项时态和语态都用错；B项时态和语态错误；C项时态错误。